A serial killer targeting young women is on the loose on the Old Peninsula Highway, located on a comma-shaped peninsula jutting into the sea, southeast of Melbourne. Detective Inspector Hal Challis is in charge of the investigation, along with a rash of burglaries and arson cases. Two women have been murdered, and a third has disappeared, leading the locals to worry that negative publicity will keep tourists from enjoying the peninsula as their holiday spot. Although the plot centers on the serial killer, other officers work other crimes, including the case of a mysterious woman, part of a witness-protection program, who is terrified when her mailbox is set alight. The beautifully described setting lets the reader feel the oppressive heat of a December summer in Australia, and the characters are well drawn and distinct. Challis himself is a likable, honorable police officer fighting his own demons along with corrupt colleagues and inept superiors.