When two murder victims turn out to be members of the same group, Danny suspects a serial killer; Erin faces off with her ex-husband in court.
When Hawaii Supreme Court nominee Judge Rachel Park is being blackmailed, she hires Magnum and Higgins who go to extraordinary lengths to help her out; Rick suggests changes to make La Mariana more profitable.
Reese tinkers with Malcolm and Stevie's science experiment; while selling candy for school, Dewey fibs that the money will be used to support the war on terrorism.
The bodies of four missing boys are found in a rented storage unit, sending the team in search of a serial killer.