For his first case after returning to active duty, Pembleton (Andre Braugher) joins Bayliss (Kyle Secor) in investigating the murder of a divorced woman and her two children, with the woman's ex-husband, an Annapolis naval officer as chief suspect. In other developments Lewis (Clark Johnson) and Munch (Richard Belzer) welcome the opportunity to pin a homicide rap on slippery drug kingpin Luther Mahoney (Erik Todd Dellums) -- especially since the prime witness is Mahoney's own nephew (played by future ER regular Mekhi Phifer). And Cox (Michelle Forbes) offers moral support to Kellerman (Reed Diamond) when he is summoned before the grand jury investigating corruption in the arson unit. ~ Hal Erickson, Rovi