The team rallies together when Warrick is shot in an alleyway. Suspicion immediately falls on the police officer who tried to frame the CSI for murder.
Founding Crane, Poole and Schmidt partner Shirley Schmidt returns to help bring order to the chaotic office.
The terminally ill Daniel Post (Michael J. Fox) hosts his own funeral, an event that Denise Bauer would rather not attend.
Alan Shore's attraction to Shirley increases; Denny Crane is drawn to Bethany as he helps her try a case against an HMO.
The city's gun recovery program unearths a murder weapon, leading detectives to re-examine a case from 1987 that involved the accidental drive-by shooting of a little girl.