When the mutilated body of a young woman is discovered in Boston’s historic North End Detectives Ed Fischer and John Nadeau are called in to investigate. Despite the brutality of the crime, there are no leads and it appears to be an isolated incident. However, a second murder just twenty-four hours later in Boston’s Backbay Fens seems eerily similar and the victims appear to be linked. Before the duo can put the pieces together, two more dead are found. Faced with a rising body count and the real prospect of a serial killer on the loose, the detectives must race against the clock to uncover the killer’s hair-raising identity before he, she or it strikes again.