Imagine you could go back in time and relive 5 days of your life. Would you make the same choices, knowing what you know now? Would you hope you were altering the future? Would you want to maybe stay in the past? These are the questions the characters in Proof of Forever by Lexa Hillyer struggle with when a photo booth turns into a time machine and sends them back two years to when they were all 15.

Zoe, Joy, Tali, and Luce used to be best friends. They stuck together each summer at Camp Okahatchee. But two years ago, everything changed. Joy dropped out of all of their lives, and they just sort of drifted apart. But now Joy has brought them together, just before they are to head off to college, for the camp reunion. They all have their own things going on. Zoe has just that day broken up with her boyfriend, Calvin, after deciding she just isn’t feeling the relationship (and, if she’s being honest, she’s never really felt into any of her relationships). Tali is a wealthy “ugly-duckling-turned-swan” (her wording) who is about to find out some upsetting news about her family. Luce is gearing up to head to Princeton, where she ostensibly will continue her record of being perfect and excelling in everything she does. She’s also about to have sex with Andrew, her longtime boyfriend, before the camp reunion, but Tali shows up and ruins that plan. And Joy… well, no one knows what’s going on with her. Even though she’s the one who’s brought them together, we don’t really learn what’s going on with her until the very end of the book.

When they attempt a group picture in a photo booth, they’re somehow taken back two years in time. They figure they have 5 days to try and recreate the past to obtain the objects they were holding in the picture from the time they were originally 15—that seems like their only hope for somehow getting back to the future. They try to follow the past exactly as it happened before, but that’s a lot more challenging than they’d expected. Frankly, making the same choices and hoping for the same outcomes starts to look incredibly unappealing to most of them pretty quickly. In this extremely unexpected second chance summer, they learn surprising things about themselves that will likely alter their futures. And spending 5 days rekindling what felt like long-dead friendships? It turns out to happen just in the nick of time.

The characters are distinctive and all travel their own paths during their repeat week, but come together for the things that matter. It’s a fun, thoughtful, and unpredictable look at who we let ourselves become and redefining ourselves.

(P.S–My only quibble is this line: “…some infinities are bigger than others.” It completely pulled me out of the book. Are you intentionally quoting John Green, I wondered? I didn’t like it.)

ISBN-13: 9780062330376

Publisher: HarperCollins Publishers

Publication date: 6/2/2015