He'll do whatever it takes to find his missing sister. But playing a killer is a dangerous game...

'Eerie, smart and brutal - this is a proper chiller' HEAT

Darren Evans was only eleven when his sister Carly disappeared, along with four other teenage girls.

Eventually, a woman confessed to their murders. But Olivia Duvall never told the police where the girls' bodies were buried.

Ten years later, Darren gets a job in the psychiatric hospital where Olivia was committed, hoping he can make her tell him his sister's fate once and for all.

And so begins a chilling game of cat and mouse - one which will put Darren and those he loves in danger...