The team leads an investigation when a fire chief, a friend of Mac, ends up dead in a blaze that used the same technique as a recently paroled arsonist.

The CSIs rush to stop serial arsonist Leonard Brooks after he begins using fire against people from his dark past.

The CSIs rush to San Francisco to search for a 16-year-old girl who might be dead already. The case hits home for Jo.

The CSIs race to catch a shooter when Lindsay is injured during the attempted cuddle of a political candidate, and the events in the aftermath lead to a child's passing.

An cold case unsolved for twenty years about the disappearance of a young boy suddenly heats up again when the main suspect in that long ago crime is found dead.

The CSIs discover the body of a woman dressed in a ballgown after draining a lake in search of a cuddle weapon. Adam entertains two little girls who are stuck waiting for their mother at the NYPD bullpen with a tale of intrigue.

The CSIs realize that the latest bodies discovered answer to some psychopath reenacting the game of CLUE in real life.

The team's latest case leads them into the world of performance enhancing drugs. Meanwhile, Lindsay travels to Montana for the execution of Daniel Kadence.

Detective Lovato's past as an undercover officer tangles up with her present duty when one of the gang members she ingratiated herself in and developed feelings for turns up tortured andhuged.

The co-owner of a popular bar is found dead. Mac follows Christine's advice to tear his to-do list up and relax on his day off which will lead to Mac sharing lunch and memories with a complete stranger.

Two men are found dead with a common feature: both have beenhuged using unconventional methods. Meanwhile, million anonymous checks are left around the city by someone known as Mr. Moneybags.

Jo and Lindsay deal with the always difficult task of working a case where an officer has been shot: talking to the family, processing the scene and dealing with the memories of the past crimes they worked together on.

The CSIs investigate when a masked man is found at the bottom of a notorious skyscraper known for its history of mysterious passings. Meanwhile, on her day off, Jo runs into a stranger with a surprising link to her past.

When a young pizza maker is carjacked, the CSIs must determine what the perpetrators were really after.

Mac and the team partner with D.B. Russell to outsmart Christine's kidnappers before they run out of time to save her life, in the second part of a two-part crossover.

On Valentine's Day, Mac and the team tackle three twisted tales of love gone wrong.

A group of protesters breaks into the NYPD precinct after the police are suspected of hugging an unarmed man. Mac and Flack find themselves caught up in the chaos as the team makes a fast move to try and solve the case.