A Reese Witherspoon Bookclub Pick and set to be a major summer paperback. Your best friend killed a man. Now she needs your help. But can you really trust her motives?

On holiday in Chile with her best friend Kristen, Emily is having the time of her life. Until, one night, she finds their hotel suite covered in blood. Kristen claims a backpacker attacked her. She shouted, but no one heard. She struggled, but he was too strong.

She had no option but to kill him. And with no evidence of the assault, Emily must help her hide the body.

Emily tries to move on. But before long, the walls start to close in on their cover-up - and Emily asks herself- can she really trust her closest friend?