When Michelle's P.I. brother comes to town on behalf of his wealthy client, he enlists the help of King and Maxwell to solve the case. Their investigation leads to a strange connection between a criminally insane mob boss and the witness protection program.

When the key witness to a company's deadly chemical spill is murdered inside FBI headquarters, King and Maxwell are trapped in the building. With a killer on the loose and Special Agent Rigby's career on the line, they have only hours to solve the murder and find a new witness to testify at a Senate hearing to bring the company to justice.