When she is assigned to investigate a 10-year old cold case murder, she finds herself partnering with a local homeless veteran. Malachi is a suspect in the murder of wealthy widow Alberta Grambling-Resnick, but also the perfect partner to help in the investigation. Powers finds that the homeless are able to move about and investigate more easily than she can, as they are often ignored and therefore, nearly invisible. Resnick was stabbed to death in her home a decade earlier after announcing that she meant to change her will. There are plenty of suspects in the cold case, but Powers finds that the original investigation was slip-shod. The police didn't think to question any of the homeless people who might have had useful information. Just as Powers starts digging and asking questions, someone starts murdering the homeless.