Mike and Nikki go undercover as husband and wife in an exclusive apartment building, in an attempt to discover the identity of a thief who is robbing its wealthy residents.

A young widow asks Mike to look into the apparent suicide of her husband, who died in prison. Mike enters the prison to investigate, and discovers evidence that he was actually murdered.

Nikki is run down by a hit-and-run driver while working on a case with Mike, placing her in the hospital in critical condition. Mike blames himself and begins to question his real motives for being an investigator, as he falls into a deep depression.