Bested on the best-selling novel by author Robert B. Parker, Joe Mantegna is Spenser - Boston's best-known private eye. Called upon to investigate a case of murder, corruption, and betrayal, the super sleuth finds himself marked for death and on the run from a ruthless international assassin.

Years ago, the Taelons came to Earth, offering friendship and technology to humanity. But there are those who believe the Taelons have more sinister motives.