U.S. police chief Bill Hixon lands in the British town of Boston, Lincolnshire, with his 14-year-old daughter Kelsey in tow hoping they can flee their painful recent past. But this unfamiliar, unimpressed community will force Bill to question everything about himself and leave him asking whether it’s Boston that needs Bill, or Bill that needs Boston?

The story of Victorian serial killer Mary Ann Cotton, a poisoner whose methods leave no visible scars, allowing her tally of victims to mount, unsuspected by a Victorian society unable to conceive of a woman capable of such terrible crimes. Traveling around the North East, she insinuates herself into unsuspecting families, marrying and creating new families of her own – before killing them, taking their money and moving on.