The shooting of a 14-year-old boy in front of his 12-year-old brother takes Detective Mac Taylor's drive for justice to another level.
When a slab of concrete starts bleeding in midtown, the CSIs' investigation takes them into the underground world of hardcore fighting, where men moonlight as "weekend warriors" for the pleasure of a live viewing audience.
The dispute between two construction workers ends up in a gruesome way when the body of a former boxer is found under a solid block of concrete.
Horatio and the team work to figure out why a seemingly normal family was targeted in a brutal grenade attack.
It's one of the most puzzling cases they've ever tried to crack, as Horatio and the CSI team look into the reasons for a brutal attack on a supposedly everyday American family. What really bugs Horatio is why the attackers would use grenades.
Langston and Nick are called to investigate a murder at a fast food restaurant and have quite a task ahead of them when they discover that much of the evidence is coated in cooking oil.
When a father finds his teenage son's notebook full of violent images and blueprints of his high school, he turns to CNU to prevent a hostage situation before it's too late.