The ongoing investigation of Kellerman's (Reed Diamond) possible involvement in corruption in the arson unit hits the front page of The Baltimore Sun. Even worse, Kellerman may be suspended from duty on the word of an unsavory federal witness -- and not even a polygraph test can determine who is really telling the truth. Elsewhere, Munch (Richard Belzer) and Cox (Michelle Forbes) clash over the cause of death in a homicide investigation, even after Munch extracts a confession from a suspect. And having been booted out of the Lewis' house, Brodie (Max Perlich ) moves in with Howard (Melissa Leo). ~ Hal Erickson, Rovi