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Time Equation #1

Heart of Fire Time of Ice

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CAN A MODERN WOMAN LEARN TO SURVIVE IN THE ICE-AGE?

Physics doctoral student Kathleen Whitby is a pathetic figure around campus. Completely focused on her research, she fears and actively avoids all social contact. Her difficult past has led to an extreme distrust of other people and the ingrained fear that her physical scarring would make it impossible to develop a relationship.

Kathleen's quantum physics research guides her development of mathematical formulas and leads to the conclusion that time-travel is possible. Her discovery inexorably sets off a horrifying series of events that results in her temporal displacement into the Pleistocene. She translates into the time of the Younger Dryas - a period where the global temperature abruptly cools an average of ten degrees and causes the advance of glacial ice sheets.
She must now learn to survive in a hostile and cold wilderness. The ice-age environment forces her to confront her worst fear as she finds that trust in a handsome, primitive hunter becomes paramount in order to survive.

Can she overcome her fear? Will the harsh climate and fierce beasts of the Younger Dryas force her to ignite a carefully suppressed, internal fire, or will she be able to return to the safety of the present?

411 pages, Kindle Edition

First published February 1, 2016

171 people are currently reading
149 people want to read

About the author

E.S. Martell

23 books17 followers

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5 stars
72 (37%)
4 stars
54 (27%)
3 stars
48 (24%)
2 stars
10 (5%)
1 star
9 (4%)
Displaying 1 - 20 of 20 reviews
Profile Image for SheLove2Read.
3,102 reviews203 followers
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June 10, 2019
It's not often that I'm at a loss for words, but here you go. What the hell did I just read?
0 stars
Profile Image for Maurice.
867 reviews
April 14, 2020
I've never read a book set that far back in time before, and therefore was really intrigued by the premise of this one. And unsurprisingly the setting ended up being my favorite part of the story. The descriptions really made the time period come to life, although it maybe wasn't all super realistic, but that didn't bother me too much.

I loved having a portagonist who studies physics, and how there were quite some scientific aspects included. The time travel itself is at least somewhat explained with physics, which I thought was quite cool. There were some details in the time travel that I thought could have been explained in an even more interesting way, but that was probably just the physics nerd in me overthinking things.

However, I didn't care about the romance. I think that was because I didn't care for Kathleen's character either. I mean, let's be honest, the real star of the book was Ulfsa anyway. Because who cares about a relationship between two humans, when there's an adorable little wolf in the story? Not me for sure, I only wanted to read about the wolf.

There is disability representation, Kathleen has those scars that sometimes make it hard for her to walk/move. However, she does have quite a lot of negative thoughts about them and keeps thinking about how ugly they make her. That does get resolved eventually, but only because of the love interest. I just would have wished for her self-acceptance to have come out of her own character development, and not only because a man fell in love with her.
Profile Image for Auj.
1,678 reviews118 followers
May 5, 2020
The beginning was hard to read, all the math I just had to skip that. Wow, I was impressed with the author's intelligence. Though it doesn't seem possible to be able to time travel by imagining the equation in your mind...

Then the beginning of Kathleen's time in prehistory was just boring, and required major skimming. I didn't start getting into the story more and reading every detail until Cyendrian (how do you spell his name again lmao) thought that he loved her. Then every day was interesting, something happened that they had to fight or overcome. The poor pair, they never got a break or a rest day. Every day, they had to hunt. It was interesting though, I'm glad I finished it because I almost didn't, and if it didn't get more interesting after a while (the romance and sex--lol, the sex didn't get too interesting but I read the book anyway), I was going to put it down.
omg and their wolf was so cute...

Not sure why she wanted to live in the past with him, even more in the past. Yeah, they would be safe from all other humans (how did she know that besides?), but why would you want to spend every day of your life hunting? And not doing anything else? The way that they were living reminded me of the pyramid with the hierarchy of needs. Since they're totally preoccupied with surviving day to day, hunting new meat every single day, they don't have time to worry about other needs...but like there's no purpose to your life if you're just hunting every day and delaying your inevitable death...lol that's a comforting thought.

also the beginning was a bit annoying cuz Kathleen kept withdrawing from him while they were kissing because she doubted his attraction to her and thought her scars would repulse him. I didn't fully understand how she acquired them. Why would they try to abort her with the saline when she was already born?? very confused me

Yeah, but don't read this for the romance or anything. Read for the everyday life and the suspense.
718 reviews11 followers
April 1, 2019
Incredible Adventure !

This was the most enjoyable experience in reading that I have had the pleasure to read in a long time. This dramatically portrayal of time travel with suspense,romance and intriguing story with amazing characters was so skilfully crafted by the author it kept me on the edge of my seat from beginning to end. A five star read!
Profile Image for Susan Weintrob.
207 reviews2 followers
June 9, 2019
Great time travel

Such an interesting and unique time travel with strong characters and plot twists that kept me guessing. The wounded heroine motif makes this novel a type of quest genre, as well as a time travel romance enhanced by the very good writing.
35 reviews
June 19, 2019
Loved this book

I loved this book. Eric may be my new favorite author. This book is filled with suspense and action thru out the whole book. You never know what is going to happen next. Read it, you won't be disappointed.
Profile Image for Peggy.
139 reviews1 follower
July 30, 2019
Heart of Fire. Time of ice review

Interesting story. Not being a scientist, I didn’t have the smarts to know if the Time equations were just for effect. But it seemed a clever basis for this travel as was the impetus for the first trial.
Her time of ice dragged on somewhat for me and her fears seemed a bit incongruous and I don’t get the “heart of fire”. Otherwise, editing and writing good, ending cute, and I’m intrigued enough to read the next in the series. Recommend.
Profile Image for Flea.
340 reviews6 followers
August 29, 2024
DNF @ 59%.
I'm going through a time travel stone age genre obsession right now and paid money for this book because it wasn't on KU. I feel regret.
I skimmed a lot. The FMC drove me crazy. She's supposed to be smart, but she wasn't. She was TSTL. Her inner monologs were on repeat to the point that skimming through her POV's was a must.
I was bored. I might try to come back another time and try again because I own it now, but I doubt it.
Profile Image for Kathy .
1,302 reviews3 followers
June 18, 2019
Interesting concept

I found this story interesting. Time travel tales always blow the mind a bit. What I found most rewarding was that Kathleen was able to finally love herself, even though she had to travel to the ice age to accomplish this. The conclusion was a bit farfetched for me, but I still want to read more. I'm intrigued.
Profile Image for Lucinda.
714 reviews1 follower
December 1, 2019
Huh?

Some elements needed a bit more explanation. Kathleen's scars are sort of explained, but not medically. And she sure does the pity party a lot. I like Cadeyrin. That man just keeps right on going. I'd give the story about 3.5 stars. I don't know if I'm interested enough to buy the next book.
1,218 reviews
June 22, 2024
This time travel story has a very unique plot filled dangers present and prehistoric. Both are just as life threatening and world changing to the future of humanity. The time Kathleen Whitby, the heroine and extremely intelligent physics student, spent in the past ice-age with her lonely roaming hunter, Cadeyrin, was gripping and the best part of the entire story. Good Read!!!!
1 review
February 15, 2022
A very compelling time travel novel. Martell's descriptions of the dangerous ice age environment and the animals that roamed at that time were very believable. I finished it quickly and couldn't wait to start the sequel.
36 reviews1 follower
June 10, 2019
Great read

Great characters. I love time travel , not sure I would go this far back, looking forward to your next book.
Profile Image for MK.
52 reviews2 followers
June 12, 2019
Good book!

I enjoyed this rather unusual time travel story. I love reading about how early humans lived. Rather strange ending. Nice romance.
8 reviews
June 15, 2019
Loved the story

I loved the story. Somewhat confusing but enjoyed. Getting ready to read the next book. I would recommend the book to those who like some the different.
7 reviews1 follower
June 20, 2019
Actually 3 stars are 3 stars too many.
Hated this book. Redundant (that’s actually a pun lol) boring and the ending was abrupt.
Sorry I wasted my time.
8 reviews
June 23, 2019
Headline

This was a fun book. I liked the spiritual flavors mixed into the story. I am looking for the sequel now :)
Profile Image for 1 Way Ticket.
76 reviews
Read
August 19, 2019
This book took forever to get to the time travel stuff. I found it boring and constantly telling. Also very redundant. DNF. No rating.
30 reviews1 follower
September 25, 2016
Easy read

Okay I want to do a short and sweet review the book was good , romance scenes are not steamy at all , I do like that the author referred to Science and I wish there had been more living in the past and there was an overwhelming amount of action, but then again line at the time period it was set in. I do feel like the ending of the story was wrote in one paragraph but with that being said it was a good read. I would love to hear more of Kathleen's story like A Part 2
Displaying 1 - 20 of 20 reviews

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