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Quint Adler #6

A Knife Through the Heart

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★ Book 6 of the Quint Adler Series ★ "The Quint Adler thrillers seem to get better with each book!" ~ Ed Eldrige
Archer Keats, a prominent businessman, is arrested for the brutal murder of his wife. His legal defense team approaches Quint about joining them as an investigator. Grudgingly, Quint accepts, but quickly realizes this isn't a simple case of "Did he or didn't he?" There's a lot more going on and a whirlwind of suspects begin to emerge. A Knife Through The Heart  is a whodunit that will leave you guessing until the final page!

236 pages, Kindle Edition

Published March 14, 2022

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About the author

Brian O'Sullivan

19 books1,337 followers
Librarian Note: There is more than one author in the GoodReads database with this name. See this thread for more information.

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5 stars
415 (63%)
4 stars
204 (31%)
3 stars
35 (5%)
2 stars
3 (<1%)
1 star
0 (0%)
Displaying 1 - 30 of 32 reviews
6 reviews1 follower
March 16, 2022
My favorite so far. I had it all figured out and was feeling pretty smug, then you threw a wrench and knocked me down. Good job. I'll get it right next time!
Profile Image for Christina H.
25 reviews
October 3, 2025
I'd like to give it 4.5. This one had me talking back to it haha
272 reviews3 followers
April 2, 2022
A knife Through The Heart is book 6 in the Quint Adler Thriller series. Well, our favorite P.I. is on a new case. This one is a little different from previous cases. Quint has been called by a defense team preparing to go to trial on a horrific murder case. Walnut Creeks popular restauranteur Archer Keats is getting ready to go on trial for the murder of his wife. Quint has been called in to basically interview potential witnesses, and get as much background information on these witnesses to see if they are fit to put on the stand when the trial starts. Quint is not sure if Archer is guilty or innocent, but he is keeping an open mind. Quint's spidey senses go up and he starts to look at everyone as a suspect, and as always in true Quint Adler fashion, more murder and mayhem ensues. As the story starts to wind down and you think we will find out if Archer is innocent or guilty, there is a holy sh*t twist, that I did not see coming. So I'm going to leave that right there. If you are a Quint Adler fan get this book ASAP!. If you are not familiar with author Brian O'Sullivan and the Quint Adler books, start with book 1 "Revenge At Sea". Then checkout Brian's other stand alone books, you will not be disappointed. I can't wait for Brian's next book, whether it's another Quint Adler book, or a new stand alone story.
Profile Image for Judy T.
14 reviews
March 30, 2022
Another great read

Another great read in the Quint Adler series.Each one is better than the last. A little different than previous books but just as intriguing and thought provoking. It kept me guessing right up until the last page. Quint is so easy to relate to, he speaks in words and sentences I can hear myself saying. I love watching him grow in each book. The worst thing I can say is I'm always a little lost when I've finished because I have to wait for the next book to come out.
Profile Image for Kelli.
156 reviews
November 6, 2024
In the beginning of the book, I found this a bit of a different than others in the Quint Adler series, but in no time, Quint showed himself! We see some familiar and some unfamiliar characters, all adding to the overall story. The main character, Quint, is loveable, outrageous, observant (most of the time), and persistent, all qualities I would want in a PI! In A Knife Through The Heart, he finds himself reluctantly embroiled in a legal case. As the story develops, he cannot help but go off the well-traveled path onto one of his own making. Another 5-star read by Brian O'Sullivan!
1 review
May 6, 2023
Terrific writer and plot creator.

I don't think it's easy to write credible dialog. This author's character's voices draw you right in to the situation and personalities and stays true throughout the novel.

The plot twists are genius and have you saying," didn't see that one coming!" Can't wait for # 7..
Best series I've read.
3 reviews
May 1, 2022
A excellent mystery wrapped in a good murder plot!

Anyone who likes a good mystery should enjoy this book. Lots of twists and turns! The final resolution is not obvious so it really holds your attention. Now on to the next Brian O'Sullivan book.
1 review
January 25, 2023
Cliff Hanger Alert

This one is the best of this series! I hope there will be more. They keep getting better and better. Anyone who loves murder mysteries will enjoy the entire series
Profile Image for Patti.
329 reviews17 followers
March 3, 2024
Wow.

"A Knife Through The Heart" keeps you guessing. It's a true whodunit packed with suspicious characters and multiple motives.
By the time the story wraps up, you'll be gasping for breath, the effect of "A Knife Through The Heart."
Profile Image for Jenn.reads.books.
152 reviews4 followers
September 18, 2024
A knife through the heart

Book 6 of this series and it didn’t disappoint. I think this one has been my favorite so far. It was different premises from the other books and I was sure I had it figured out but I was SO WRONG!
19 reviews
September 23, 2024
Another great one.


The sixth book in the Quint Alder series is another great one. Each book has a different type of scenario he is investing, and this one was great as well. It kept me guessing until the very last page.
1 review
March 27, 2022
Brian O'Sullivan

Once again a great book could not put it down can't wait for the next Quint Adler book talk to you on Twitter
42 reviews
March 28, 2022
Club Sandwiches ahead

The Quiet Adler thrillers seem to get better with each book. A self contained story with a strong hint that this is only part one.
Profile Image for Bonnie.
52 reviews2 followers
March 30, 2022
wowwwwwww

Twists and turns. Great characters!! Start reading it early I think morning or you will be up all night to finish it!
18 reviews
May 3, 2022
Excellent!

You had me going in so many directions my head was spinning! I quite enjoyed all the surprises. Had fun reading this book.
Profile Image for Missy Nemeth.
114 reviews1 follower
May 16, 2022
Easy reading style, as are all Brian O'Sullivan books. A little slow in the trial chapters, but the end was a good twist.
Profile Image for Joss.
232 reviews4 followers
November 28, 2022
What a twist!

Awesome story!
I thought I had it, then the big twist, followed by an even bigger one to keep you guessing!
2 reviews
January 4, 2023
Great read. Couldn’t put the book down until I was finished.
13 reviews
April 22, 2023
Best Quint so far

I have enjoyed these books. This one has been the best so far. I liked the fact Quint was not ever in mortal danger!

Profile Image for Fiona.
5 reviews1 follower
September 6, 2024
This book had me hooked! My favourite Quint book after the Bay Area Butcher!

I really enjoyed the twists and court scenes. Looking forward to Quints next journey.
330 reviews5 followers
December 18, 2024
I received my autographed copy of this book and the author wrote that the ending was nuts. True!! 🤯🤯
Profile Image for Katie Turner.
203 reviews
May 29, 2025
I already knew who did it halfway through. This was the most boring thriller to me.
244 reviews6 followers
June 13, 2025
This was good, but not my favourite Quint adventure. It lost me for a bit there in the middle, and I did some skim reading to get to where it got good again!
7 reviews1 follower
January 13, 2026
Mind blowing

This story of a troubled marriage...twisted affairs...suspects at every turn had me guessing until the very last page. Truly amazing story telling!
106 reviews1 follower
January 15, 2026
Another very good book in the Quint series. I suspected everyone in the family but didn't see the very last twist coming.
Profile Image for Lucy Reid-Pudalik.
48 reviews
May 6, 2026
Quint Adler Book 6

Another well written book by Brian O Sullivan that was full of twists and turns throughout. The ending was an unexpected one. Onto book 7 now.
4 reviews
May 31, 2022
ANOTHER FAST AND ENJOYABLE READ!

Brian O’Sullivan does it again with another read you just can’t put down.

Suspense and humor keep you engrossed, with twists and turns aplenty.

I already can’t wait for Brian’s next book! Read the entire Quint series.
Displaying 1 - 30 of 32 reviews