From E. Lockhart, author of the New York Times bestseller and Zoella Book Club 2016 title, We Were Liars, comes a story about one girl who saw everything . . .

'I think this might be the best YA novel...I've ever read. It's hilarious, and it's so very smart. I mean, I'm serious...It's really amazing.' - John Green, #1 New York Times bestselling author of The Fault in Our Stars

At the Manhattan School of Art and Music, where everyone is unique, Gretchen Yee feels ordinary. It doesn't help that she's known as the shy girl who sits alone at lunch, drawing pictures of her favourite superhero, just so she won't have to talk to anyone.

It's no surprise that Gretchen isn't exactly successful in the boy department. Her ex-boyfriend is a cold-fish-sometimes-flirty ex who she can't stop bumping into. Plus, she has a massive crush on a boy named, Titus but is too scared to make the first move. One minute he seems like a sensitive guy, the next, he's a completely different person when he's with his friends. She can't seem to figure boys out!

Gretchen has one wish: to be a fly on the wall in the boy's locker room. What are boys really like? What do they talk about?

This is the story of how one girl's wish came true.