Gil Grissom and Sara Sidle come to the aid of a former colleague who is implicated in tampering with evidence; Maxine and the rest of the CSI team work the murder of a couple slain on their wedding day.
Catherine Willows persuades Maxine Roby to let her rejoin the team; a dominatrix is found murdered near her secret sex dungeon.
Max puts CSI on lockdown when evidence in a new murder tips Grissom and Sara to a new suspect in the crime lab; Folsom and Allie investigate a series of chilling killings at a dilapidated clown-themed hotel.
When David Hodges goes missing, the CSI team searches for any piece of evidence that can help locate him, clear his name and save the reputation of the crime lab.
The CSI team investigates the eccentric world of sideshows when a couple of performers are discovered burned in a pit; Hodges mulls a plea deal as his criminal trial begins.
