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.
In one of the most puzzling cases they've ever tried to crack, the CSI team look into the reasons for a brutal attack on an everyday American family.
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.
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