Leeds. June, 1913. Tom Harper has risen to become Deputy Chief Constable, and the promotion brings endless meetings, paperwork, and more responsibilities. But his attention is jarred a letter arrives from police in New York: Davey Mullen, an American gangster born in Leeds, is on his way home fleeing a bloody gang war.

Mullen’s arrival triggers a series of chilling events in the city. Is he responsible for the sudden surge in crime, violence and murder on Leeds’s streets? Tom has to become a real copper again and hunt down a cold-blooded killer, even as his world starts to crack apart at home.