It's a brutal winter in Des Moines, Iowa, and the city is gripped by fear. A serial attacker known as the Sin Eater is stalking women and has just struck again. It's a tough time and a tough place for Riley Fisher, a former small-town sergeant, to be reporting for duty as an FBI agent on her first assignment.

Teamed with a man she's not sure she can trust and struggling to prove herself - while fighting the pull of her old life and family dramas - Riley is tasked with investigating a vicious death threat against the newly elected female state governor. Gradually, she traces a disturbing connection between this case and the hunt for the Sin Eater. Through snow, ice, violence and lies, Riley Fisher is drawn towards a terrifying revelation.

It's a brutal winter in Des Moines, Iowa, and the city is gripped by fear. A serial attacker known as the Sin Eater is stalking women and has just struck again. It's a tough time and a tough place for Riley Fisher, a former small-town sergeant, to be reporting for duty as an FBI agent on her first assignment.

Teamed with a man she's not sure she can trust and struggling to prove herself - while fighting the pull of her old life and family dramas - Riley is tasked with investigating a vicious death threat against the newly elected female state governor. Gradually, she traces a disturbing connection between this case and the hunt for the Sin Eater. Through snow, ice, violence and lies, Riley Fisher is drawn towards a terrifying revelation.