Watch THE CALENDAR KILLER on Amazon Prime now - a gripping adaptation of Sebastian Fitzek's bestselling novel WALK ME HOME.

Good morning. It's 7.35 a.m. And you're listening to your worst nightmare.

A psychopath has taken six people hostage at Berlin's leading radio station. He's playing a dangerous game with the listeners.

Every hour, a telephone will ring somewhere. Maybe it will be in your house. Or your office. And if you can't play the game, a hostage will die.

Renowned police psychologist Ira Samin must negotiate with the hostage-taker live on air. With the nation listening, he makes his sole demand: bring him his fiancée.

There's just one problem: she died in a horrific car accident eight months ago.

Facing an impossible demand, Ira must race against the clock to resolve one of the hardest negotiations of her career.

And all the while, somewhere, a telephone is ringing...

A terrifying and twisted thriller from international bestselling author Sebastian Fitzek, perfect for fans of John Marrs and Karin Slaughter.

'Fitzek's thrillers are breathtaking, full of wild twists' Harlan Coben
'Fitzek is simply amazing... A true master of his craft' Chris Carter