A group of protesters breaks into the NYPD precinct after the police are suspected of killing 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. On the personal side, Mac contemplates his future with Christine.moreless
At Valentine's Day the CSIs get a taste of both the sweetest and the sourest that life can offer as they work on three twisted tales of love gone wrong.
The co-owner of a popular bar is found dead. Meanwhile, Adam is forced to come to terms with his past so he can look ahead.
The CSIs realize that the latest bodies discovered answer to some psychopath reenacting the game of CLUE in real life.
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 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.
A violent shooting leaves Mac in a limbo between life and death and with a choice to make. While he struggles for his life, it's up to his team to bring the shooter to justice.moreless
Mac and his team try to get to the bottom of the murder of a successful businessman who still felt the pull of his old neighbourhood by going to a Brooklyn housing project and speaking to the victim's old friends and neighbours.moreless
A wave of brutality threatens a small New York City community. As Flack investigates a crime after a body is found dismembered and strategically left out on four street corners he is surprised by an explosion.moreless
The CSIs discover secrets about the lab after seeing connections to a case in the 1950's that may help them figure out why a lab tech was killed.
A FBI agent questions Michael's new method of solving cases via "hunches" when the detective tracks down a serial killer long believed to be dead, based on what he sees in the other reality. Meanwhile, Hannah wants to move back to Oregon and both of Michael's psychiatrists warn that if he leaves Los Angeles, his dreams could disappear.moreless
A bike courier, minus his bike, tumbles to his death down the 187th Street Steps and a man out for a jog is found impaled by a hunting arrow against a tree. There is no apparent connection between the two except for an unusual type of chewing gum. Meanwhile Mac and Jo try to get to the bottom of Sid's mysterious absences.moreless
A fun game gets all too real when one of the players gets murdered by a killer and another player is held for ransom.