What would you do if your closest friend tried to steal your life?

I’d like to describe how L. came into my life, and in what circumstances. I’d like to describe precisely the context that enabled L. to invade my private sphere and patiently take possession of it.

But it’s not that simple.

Based on a True Story by Delphine de Vigan is the French thriller that’s causing ‘a word-of-mouth frenzy I’ve not seen since Gone Girl’ (Telegraph), ‘combining the allure of Gone Girl with the sophistication of literary fiction’ (Independent). If you’re a fan of twists, turns, and completely losing yourself in a book, this ‘dizzying’, ‘mesmerising’ thriller (Woman & Home) won’t disappoint. It’s so good that it will even be hitting the big screen, with a major film adaptation starring Eva Green and directed by Roman Polanski coming soon.

We’re giving you the chance to win one of FIVE sets of the stylish Fujifilm Instax Mini 8 Instant Camera plus a copy of the book, so you can recreate the cover art with your friends (or frenemies). Just answer the question below.

And in the meantime – don’t trust this book.