The international bestselling YA thriller by acclaimed author Karen M. McManus - now available in a bold new cover look complete with a blood red background and matching sprayed edges.

Five students walk into detention. Only four come out alive.

Yale hopeful Bronwyn has never publicly broken a rule.

Sports star Cooper only knows what he's doing in the baseball diamond.

Bad boy Nate is one misstep away from a life of crime.

Prom queen Addy is holding together the cracks in her perfect life.

And outsider Simon, creator of the notorious gossip app at Bayview High, won't ever talk about any of them again.

He dies 24 hours before he could post their deepest secrets online. Investigators conclude it's no accident. All of them are suspects.

Everyone has secrets, right?

What really matters is how far you'll go to protect them.

'Tightly plotted and brilliantly written, with sharp, believable characters, this whodunit is utterly irresistible' - HEAT

'Twisty plotting, breakneck pacing and intriguing characterisation add up to an exciting single-sitting thrillerish treat' -THE GUARDIAN

'A fantastic murder mystery, packed with cryptic clues and countless plot twists. I could not put this book down' - THE SUN

'Pretty Little Liars meets The Breakfast Club' - ENTERTAINMENT WEEKLY

But the story doesn't end here, it continues with One of Us Is Next. . .