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Chronicles of Cain #1

To Kill a Unicorn

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The gods are dead. The fae rule Gaia.

Cain used to kill for the fae. The only human to become a member of the Oblivion Guard, he killed one time too many and had enough. Leaving it all behind wasn't as easy as turning in a resignation. But the fae had trained him well and soon it was they who bargained for him to leave Feary and live in exile in Gaia.

Now a tracker for an assassination and bounty hunting agency, Cain doesn't kill anymore. When his mission to track a teenage girl goes horribly wrong, he and the girl end up on the run from powerful forces the likes of which he's never seen before.

That's because the fae have been hiding a terrible secret. The gods aren't dead. In fact, they're very much alive and killing humans they deem too powerful to survive. The girl is in their crosshairs and now he is too.

To make matters worse, Cain discovers he's dying from the curse of Cthulhu. The cure? Eating a living, beating unicorn heart. Cain thought unicorns were extinct, but a mystery party offers him salvation: a unicorn for the assassination of the leader of the Mages Guild.

With the gods, the fae, and the rest of the supernatural world hunting the hunter, the odds don't look good. But Cain has survived too much to give up now. And the high and mighty are about to find out what real fear feels like.

430 pages, Hardcover

Published May 14, 2021

692 people are currently reading
727 people want to read

About the author

John Corwin

80 books547 followers
John Corwin is the bestselling author of the Overworld Chronicles.

He enjoys long walks on the beach and is a firm believer in puppies and kittens.

After years of getting into trouble thanks to his overactive imagination, John abandoned his male modeling career to write books.

He resides in Atlanta.

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5 stars
560 (49%)
4 stars
361 (32%)
3 stars
148 (13%)
2 stars
41 (3%)
1 star
12 (1%)
Displaying 1 - 30 of 87 reviews
Profile Image for Kc.
11 reviews
December 28, 2020
I liked it well enough. A decent story however, I didn't care for the way the female characters were portrayed. I don't think I will continue the series.
Profile Image for Lindsay.
68 reviews3 followers
July 7, 2020
I can't figure out how this author has published more than one novel. My resounding final thought: this author must really hate women. Every single female character is shown in some derogatory light. 90% of the book is the female characters fighting and tearing each other down in what seems like the author thinks is normal female banter. The author also clearly has no idea about what trauma looks like in a 16 year old girl-- she's not going to be cuddly, caring and innocent if she's been molested. Moreover, there was literally 0 relationship building accomplished. The main character went from thinking of a girl as a nuisance and planning to dump her the first chance he got to suddenly calling her "sis" within two days with barely any interaction. It's forced and unbelievable. Moreover, there are random sexual components thrown in for no reason--They don't further the plot nor do they build character. They feel shoe horned into the story but lord knows why.

The premise had promise before it became extremely convoluted. Giant plot holes run amuck from too many elements introduced in order to leave openings for sequels. Rather than leaving the reader wanting more, it just makes the reader slog through an ocean full of unnecessary information. While the 1st person voice is decently entertaining, all else about the characters in the novel is atrocious. While women are painted horrible, all other male characters are painted as one-dimensional hyper cliches of what they should be like the "wizards" dressing like Gandolf with beards and robes and speaking as if they're badly rewritten Shakespeare.

Absolutely horrible. Do not read.
This entire review has been hidden because of spoilers.
Profile Image for Diane.
617 reviews4 followers
January 13, 2022
I'll write this review the same way I wrote to the author on his Facebook page: Mr. Corwin, I have a complaint, you have sadly disrupted my life. I finished some chores the other morning and thought I'd sit down with a cup of coffee and start a chapter or two of a new book before I went out to the shop and worked on some orders that I needed to complete. I randomly chose To Kill a Unicorn as it's been on my TBR list for a while. Fast forward several hours, and I"M STILL READING! I had stuff I should have done today, now I'll have stuff I need to get done tomorrow and I'll have one less day to get that stuff done - and that's if I'm able to finish this book tonight and get any sleep! I just. Can't. Put. This. Down!

I'm so pleased to find a new (to me) author that I like and am excited to move on to the next book. I highly recommend this story if you like urban fantasy. It usually takes me a chapter or so to decide if I'm going to finish a book, but this one hooked me from the first paragraph and didn't let me go until the end.
674 reviews4 followers
September 9, 2022
My first time with this author.

I do very much enjoy Urban Fantasy and this one ranks up there for me.
Cain is a very good character and Layla rivals him for top honours in this book.

Lots of action and some twists and turns to keep you going.

If you are a fan of Jim Butcher you will be right at home here.
631 reviews15 followers
June 15, 2020
Not good

Wow a supper assassin who is a whiny and not very good at his job was disappointed with this book
3 reviews
June 29, 2022
Couldn't put it down

This is the first book I read from John Corwin, buy definitely will not be the last.
I loved everything about his characters and there interactions was fun yo watch from page 1. Watching Cain become more "human" was believable and I enjoyed his evolution.
Couldn't put it down and looking forward to the rest of the series.
Profile Image for R..
1,665 reviews52 followers
December 7, 2021
"Play stupid games, win stupid prizes, die a little more inside."

The above quote was from the book yes, but I chose it for this review because that's how I felt reading this book a little. There was so much potential, but it was hard to take the book serious. I mean, even the other characters in the book were making fun of the protagonist for being a horrible assassin and making terrible mistakes. It was like the writer wasn't sure if he wanted the protagonist to be a bad ass or someone like Jar Jar Binks that wanders into a room and accidentally kills two dozen droids flailing around like a moron.

I picked up this book because I was looking for something else like the Iron Druid. For me, this didn't cut it. The writer did give a nice nod to both the Iron Druid and the Dresden Files. This was definitely Urban Fantasy, but I'd have to say it was also maybe more of a Young Adult book despite some strong language and that's how I've personally shelved it. Fifteen year old me would have loved this and rated it higher.

That said, if you get it as a free book on Amazon like I did, at least you didn't pay.
Profile Image for Todd.
2,174 reviews8 followers
August 25, 2022
Interesting book. Cain is a former assassin, also the only human to serve as a member of the Oblivion Guard, picture secret service for Fae royalty.
Cain escaped his job with the Fae and returned to Gaia(what the Fae call Earth). Now he's a tracker, who finds and marks targets for either capture or assassination.
When he finds his latest target, a teenage girl he finds he can't let her be killed.
Cain is pretty much universally hated by everyone, Fae, humans etc. But because he wants to protect the girl essentially he's putting his own head in the noose.
Profile Image for Cari Elliot.
91 reviews7 followers
August 14, 2021
Good story, bad humans

The plot and storyline are fine. The writing is technically good. But some of the character interactions feel really off. They don't interact like actual humans; their dialogue tastes vaguely like a really good AI wrote it. It was just super off-putting in an otherwise decent book. I probably won't continue this series.
Profile Image for Logan Horsford.
566 reviews21 followers
January 8, 2021
The MC had better be an amazing magician (he's not) because he is not only inept at being an assassin but is mentally unsuited for the task.

The fact that he is touted as being good enough to have reputation shows he is living in a world of stupid people.

I lost interest quickly.
Profile Image for Gareth Otton.
Author 5 books127 followers
January 29, 2024
To kill a unicorn by John corwin was actually quite an enjoyable urban fantasy novel. While it doesn't do anything to stand out majorly from other novels in the genre, it does enough right that you can enjoy it for the light easy reading novel that it is.

It's the equivalent of the comfort of home cooked food. It might not be restaurant quality but it's still enjoyable all the same.

However, as is the case with home cooked food. It's often quite blunt and straightforward. That's not a problem most of the time but every now and again it needs to be something more. This novel dealt with a topic that needed to be handled with delicacy and subtlety. Unfortunately that's something that this novel lacked.

The storyline with Hannah was just a little too blunt for what was called for. A lot of the outcomes didn't feel earned and they happened too fast to feel natural.

Overall though, I really enjoyed my time reading this book. Now I'm looking forward to seeing what happens in the next one.
Profile Image for Donna.
1,712 reviews1 follower
August 8, 2022
Did you ever have one of those days where everything went to hell in a hand basket? Yeah, so did this guy.

Cain is a former assassin who abruptly changed careers after he completed a mission that he just couldn’t justify. Instead he became one of his employer’s best trackers. Unfortunately, those targeted were then just killed by someone else.

Cain once again rebels when his latest job involves a teenage girl. He marks her but then has a change of heart. The actual assassin has already shown up so Cain decides to rescue her. That turns into a whole boatload of trouble for him.

This book had humor, drama, mystery, a bit of romance, rejection, magic, paranormals, etc. Good v. evil was murky, much like real life. I liked it.

Profile Image for Jordan Steinhoff.
512 reviews5 followers
August 9, 2022
So, the cover does the book a bit of a disservice. It's got a bit of a cheesecake feel to it even though he's all covered up.

Aside from that, no complaints about this book. More urban fantasy along the lines of Dresden or Verus. There's rules for magical folk to prevent them from revealing themselves to the non-magical population. There's a fully fleshed out magical community with factions and history. Everything you want to feel like you're stepping into a thought out world.

It's pretty standard but well done. The main with the dark past. The various sidekicks there to both help or hinder as needed. The damsel in distress.

Enjoyable with good characters, good dialog and good descriptions.

If you like urban fantasy, give this a shot.
1 review
September 21, 2021
Not expecting to like it so muc

I got this to try and was not expecting to like I so much. The main character’s back story sounds reprehensible on the surface, but this is really a redemption story. Cain keeps making moral choices despite himself until the one thing he absolutely believes he is incapable of, love for those in his charge, becomes his beacon. What works so well in this series beginning is the developing relationships between Cain, Hannah, Layla and Aura. The magical action is great and carries the story along as they discover more about the machinations and plots behind the scenes. I’m looking forward to reading the next in the series.
6 reviews
February 21, 2023
Not a strong story

Not a completely horrible read but not great either. Hard for me to feel anything for any of the characters; they felt shallow and incomplete. Also, the errors in the writing made me think the writer stopped at some parts and came back days later to pick up again without reading what he had previously wrote. In one part he writes that the waitress took their order and then Cain goes to snoop around, only to have Cain come back to the table and the waitress is once again taking their order. Proofreading is very important. Overall I just couldn't wait to finish this book and move on to something better.
6 reviews
July 11, 2020
Decent story and writing

The story is great. Action abounds, and the pacing is good, however the actions of the MC are baffling. The man has been a fighter and dealt with backstabbing his whole life, then in the course of a week he has let two people into his sanctuary he has built and kept private for years? Then after one person had already played him he let her stick around and then betray him again? And he did nothing after that either. That does not make any sense. Also, how is this steampunk? There are literally no steampunk elements in the book.
Profile Image for H.M..
Author 5 books23 followers
October 5, 2021
Weird story

This was a weird story. I’m not too sure what the plot was exactly. I enjoyed Cain’s character, and that’s the only thing that kept me reading (although I started skimming at around the 60% mark). This story was just…weird.
Profile Image for Debra Constant.
7 reviews
August 2, 2023
OMG! What a ride! I'm am VERY picky with what I read, and John Corwin did not disappoint. His imagination knows no bounds. I literally could not put this book down, and read all through the night, downloaded the next as soon as I finished, and forced myself to get some sleep.
90 reviews3 followers
July 20, 2022
Cain is a human who was brought up in Faery and was trained as a guard in service to the high Fae. He sided with them in a war with the people and creatures of Gaia and is considered a traitor by the other creatures of Gaia

He left the service of the Fae after he was ordered to destroy enemies of the Fae but having done so he discovered they were innocents caught up in the war. He is now haunted by their ghosts.

He has become infected with a deadly virus for which he is searching for a cure. While doing so he rescues a young woman who has special gifts and they become close. He protects her from various factions who want to either destroy her or use her talents for their own gain.

I did enjoy this book in a half hearted way. I liked Cain’s character, but felt the other characters were weak. I also felt the book was over long and took a long time to come to a conclusion which was obvious from the start.

Its clearly the first book in a series but I don’t think I’ll read the rest of the series.
Profile Image for Brandon Jones.
5 reviews
August 14, 2025
What a book to start a series!

this book introduces Cain, Hannah and the rest of the gang. it follows An Ex assassin. someone who seemingly cares for no one. and allows you to watch as his mental defences are utterly torn apart and his world flipped upside-down.

if you want a well written and engaging urban fantasy book. this is the one.

pros: The books is well written, and shows character growth.

The use of eldritch is well done and fairly original in how they're portrayed in this book.

the series gets better with every book.

Cons:

like a lot of writers, women are overtly sexualised to start with. but this dies down a lot after a few books.


I found a fair few of the female characters were pretty much the same person. this does also improve.

I am being very harsh in this review. sorry John! all this being said, to summerise the book. this book was amazing. and is worth the effort to get into because the character growth. development and more throughout the books are amazing.
2 reviews
April 22, 2025
What happened here?

So this started out so well. But then about 20% in, it got stupid. A relationship that started with "you're an assassin sent to kill me" went to "you're the brother I never had"..." OK, I'm your brother " with no reasonable transition.
And then it just got dumb. From "I've always liked you" to "Wait, you betrayed me so I don't trust you" to "but I promise I'll tell the truth this time" to "well, ok, but you'd better mean it". Nobody that gullible would still be alive.
The relationships between the female characters were ridiculous. In f, ALL of the relationships were ridiculous.
The concept, the general plot, the world created here were decent. But after that first20%, none of it was believable. I won't be reading any of the sequels.
Profile Image for Dax.
1,955 reviews45 followers
January 23, 2023
The character development in this was rather quite impressive. At first I kept thinking I might quit the book due to my extreme dislike of our main character. However, there were a few things that kept me giving it a chance and boy am I happy I did. Due to quite a bit of potentially triggering storylines I wouldn't recommend this book to everyone, but if you're looking for a story with a solid antihero who grows on you and makes you begrudgingly start to care, to full on rooting for him - this is your book. I know I can't wait to read more in this series and see how Corwin does with future installments.
Profile Image for Ford Miller.
695 reviews6 followers
April 10, 2023
Fun, fast paced. Worth the time, enjoyable!

The book was a pleasant surprise! Great intro to a new series that kept you guessing as to where the series was going to go. The world and plot developed was believable and logical however at times it was a simple read. Really like the main character being a strong male but not overpowered by the female characters that support him. All the characters roles felt natural instead of forced or political ideology, which is refreshing in this crazy political world. I look forward to reading the second book, this will entertain. I can't say it's as good as Butcher's Dresden work however, it's a good start! Recommend reading!
264 reviews
February 24, 2024
NO SPOILERS.

Needed a slight change in my reading pile, luckily, I came across the Chronicles of Cain series by John Corwin.

Book One, To Kill a Unicorn contained all I was looking for. A fast-paced, action filled Urban fantasy story. The story introduced you to a world that felt real, dirty, and old. By old, I mean the story dropped you into a world that had gone through many events. Through it all, Cain becomes our protagonist, peeling layer upon layer of those events. Fascinating world to explore. And characters of course.

Profile Image for Steven Parker.
64 reviews
August 15, 2024
This one is definitely different and somewhat disturbing. Corwin starts to build a series that takes the normal urban fantasy to a different place, interlacing the macabre visions of Lovecraft's twisted mind with the adventures of an antihero that is out for himself.

The story is well-written and well edited. I have to give it a five-star rating, though the reading of the first novel in the series seems to have roots in the horror genre as well. Lovecraft was a demented dude, and this one is definitely an adult read.
Author 6 books5 followers
August 26, 2024
It’s alright…

This book started off decently strong. Then something happened at the halfway point and the dialogue went down the toilet. Cain seems to be written alright but the three female characters just bitch and argue at each other like a badly written sitcom. And the sudden shift in quality hits you like a truck. The only reason this got a 3/5 is because the overall narrative had me interested and I wanted to see where things went. I genuinely hope the next book in this series improves.
174 reviews
September 19, 2024
Action packed Urban Fantasy!

Well written fast paced Urban Fantasy with fun characters!  I really like how John Corwin ties in so many Pantheons, myths, and mythological creatures into a world setting based in our current world with a new concept on magic.  Unexpected twists and turns in the plot, and the MC had to use some actual thought process, problem solving, not just be the biggest baddest dude with the strongest magic, like is so common in other Fantasy stories.  Add in a little light-hearted humor and dark humor, and this book is a winner!
Profile Image for Lisa.
3,728 reviews20 followers
January 21, 2025
Wow what a beginning to a new series! There is a lot going on! I don't know whether to admire Cain or feel sorry for him. It seems like problems keep popping up for this guy. I like his fighting skills and how he has so many different places he can pull weapons ideas from. His two friends are people I would not trust as far as I could throw them. This is set in a unique world as it encompasses both the fae and the human world.

Austin Rising does a wonderful job with narration. There are a lot of characters that he has to voice and he rocks.
Profile Image for Joan.
1,748 reviews21 followers
July 9, 2025
Not really what I thought it would be and that was a good and not so good thing.
Quirky straight forward dialogue which was fun, not a lot of talking around situations and the snark was good.
I seemed to have lost the plot of the story somewhere around the middle. I get it, he was cursed, needs a unicorn heart (seriously?) to break it/cure it and will do just about anything to get it.
Has a long and dark past that keeps bubbling to the surface to mess with this plans and thinking-that needed to be less in my opinion. I get it-you got baggage but man do you have to keep rolling that full set of baggage everywhere all the time.
Snarky back talking MFC were fun.
Don't think I will go on to the next but not sure, sometimes book 2 is better (or worse?).
Profile Image for Selena.
20 reviews
August 10, 2025
The 1st book is always the hardest

I love Cthulhu, and I loved this take on mashing faerie, Cthulhu, and supernatural together. Howeverrrr...I had a really hard time finishing it. I know the 1st book is always the character backstory and world-building, plus I have 3 kids so not totally the fault of the authors. I did find it was mostly filler until the last 25% when it escalated at the speed of light. Will definitely read the second still, because I'm ready to get to the meat of the literary sandwich.
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