In the concluding episode of Homicide: Life on the Street's two-part season-four opener, the discovery of a second body at an arson scene suggests that the fire was started to cover up a double homicide. With Bayliss (Kyle Secor) sidelined by illness, his partner, Pembleton (Andre Braugher), is reluctantly teamed with brash arson detective Kellerman (Reed Diamond), who continues to rub the homicide squad the wrong way when he turns down a transfer offer extended by Giardello (Yaphet Kotto). Meanwhile, Munch (Richard Belzer) and Howard (Melissa Leo) compete for a coveted promotion. ~ Hal Erickson, Rovi