Although several years have passed, Bayliss (Kyle Secor) continues to be haunted by his first case on the Baltimore homicide unit: the unsolved rape and murder of young Adena Watson. When a 12-year-old girl is assaulted and killed in a manner resembling the Watson incident, Bayliss becomes obsessed with finding out if the crimes are linked -- leading to a bitter argument between himself and Pembleton (Andre Braugher). Elsewhere, the squad's crime-scene photographer Brodie (Max Perlich) messes up an opportunity to express his affections for Howard (Melissa Leo). ~ Hal Erickson, Rovi