When the Deputy Mayor's dead body falls from the ceiling, along with hundreds of balloons, at a charity fundraiser, Stella and her date find themselves in the middle of the crime scene and Mac goes head to head with Robert Dunbrook.

When a man falls 20 stories to his death, and his body goes missing after it hits the ground, with no body to process, the CSI's must treat this strange development as a missing persons case.

When transferring Robert Dunbrook's son from prison to court, the NYPD is ambushed by a group of professional kidnappers who kill a member of the team and one of the CSI's lives hangs in the balance.