Harry Potter and the Prisoner of Azkaban
From Sean's list on time travel you need to read yesterday.
Total gear shift, I know, but this is going somewhere, I promise.
I was late to the party with the Potter series, and whilst not many will have the luxury of experiencing this book spoiler-free, the reason I’m recommending this is because of the impact it had on my writing.
There I was reading a book about a magic school and then out of nowhere (okay there was some allusion and one helluva Chekhov’s Gun with that necklace Hermione was rocking) it went full-on sci-fi! This wasn’t just a brief foray into time travel either, it was an entire arc that as a time travel fan I did not see coming and I hoovered up every glorious page of it like a Dyson*.
*Other brands of hoover/vacuum are available.