Homicide detective Tracy Crosswhite has returned to the police force after the sensational retrial of her sister's killer. Still scarred from that ordeal, Tracy is pulled into an investigation that threatens to end her career, if not her life.

A serial killer known as the Cowboy is killing young women in cheap motels in North Seattle. Even after a stalker leaves a menacing message for Crosswhite, suggesting the killer or a copycat could be targeting her personally, she is charged with bringing the murderer to justice. With clues scarce and more victims dying, Tracy realizes the key to solving the murders may lie in a decade-old homicide investigation that others, including her captain, Johnny Nolasco, would prefer to keep buried. With the Cowboy on the hunt, can Tracy find the evidence to stop him, or will she become his next victim?