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.

With no evidence of the assault, Emily must help her hide the body. . .

Back home, Emily tries to forget what happened, but a surprise visit from Kristen forces her to confront the events of that night.

As the walls close in, Emily asks herself: can her closest friend be trusted?