A petty officer is murdered.
Melinda must find out why the spirit of a 6-year-old girl who drowned in the family swimming pool is unsettled.
The quarterback of a women's football team is found dead in the locker room with traces of lidocaine in her system.
Joe gives Ben several tips about being a police officer; Sammy stays with Nate's family while he sorts out his marital problems; Lydia and Josie handle a drug-related murder case.