What book, if any, makes you want to believe in the possibility of time travel?
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Yes.
This one.
Very,Very, Highly Recommended
This Is How You Lose the Time War
Amal El-Mohtar (Author) Max Gladstone (Author)
https://bookshop.org/p/books/this-is-how-you-lose-the-time-war-amal-el-mohtar/18270911
I'm glad you enjoyed it.
I too have given it as a gift, a few times. When someone says, "I don't read SF, or time travel, books". I give them this.
The usual reaction is "oh my that was good."
@corlin I adore this book. I've bought it numerous times because I keep lending it to unreliable friends (I should really learn...) It's a must-have on my speculative fiction shelf. 😊