Alaska State Trooper Dan Patterson fears a serial killer is murdering women on Kodiak Island. A woman was found floating in the boat harbor in May. In October, an off-duty trooper stumbled upon the body of an 18-year-old girl in the woods, and later that month, two young boys discovered the bones of Deanna Kerr entwined in a pile of kelp on the beach. When a park ranger discovers the body of a fourth woman, Patterson calls the FBI for assistance, and FBI Special Agent Nick Morgan flies to Kodiak to aid in the investigation. Morgan quickly realizes they have too many suspects and too little evidence. Could the killer be the crab boat captain who knew two of the victims, or is the murderer one of the coaches at the high school? As the investigation proceeds, Patterson even begins to fear the killer could be someone on his task force. When the murderer strikes again, tensions escalate, and Patterson and Morgan know they must catch this monster before another woman dies.