When a beggar woman foretells of Norah killing a man named Arthur Grimm on August 13 at Vienna’s Prater, her world threatens to unravel.

The death of the beggar woman raises even more questions for Norah. While still at the place where the body was found, Norah suddenly beings to receive messages from an unknown number, warning her about Arthur Grimm.

The mysterious happenings involving Norah continue to escalate. Things are disappearing from her apartment, she is having memory lapses, and she begins to question her sanity.

It is August 13. Norah confronts Arthur Grimm at the Prater. She is prepared to do anything. But although Norah thinks she has it all figured out, everything turns out quite differently than she expected.

Norah tries to piece together the puzzling events around her – unaware she is being watched at every turn.

August 13 is rapidly approaching. Evidence of an ominous connection between Arthur Grimm and Norah’s childhood friend Valerie is mounting.