Detective Mac Taylor, his team of forensic specialists, and police officer Flack. Their game is on when the clues in a woman's murder lead them to one of the web's most addictive virtual worlds. A plot to detonate a bomb involves two scuba instructors. A guidance counselor is killed at a dance. Murders in Times Square, Central Park, and even on the Statue of Liberty test the team. All while battling Mac's nemesis, the mysterious 333 Stalker.

Title from container. Originally broadcast on CBS television during the 2007-2008 season. Contains all 21 episodes from the fourth season. Special features: Disc 2: Art imitates second life; Dante's Infernal episode; audio commentary on episode 405 "Down the rabbit hole" ; Disc 5: Art attack ; Disc 6: Cutting to the core: season 4 in The Big Apple.

Disc 1. Episode 401:Can you hear me now? ; Episode 402: The deep ; Episode 403: You only die once ; Episode 404: Time's up -- Disc 2. Episode 405: Down the rabbit hole ; Episode 406: Boo ; Episode 407: Commuted sentences -- Disc 3. Episode 408: Buzzkill ; Episode 409: One wedding and a funeral ; Episode 410: The thing about heroes ; Episode 411: Child's play -- Disc 4. Episode 412: Happily never after ; Episode 413: All in the family ; Episode 414: Playing with matches ; Episode 415: DOA for a day -- Disc 5. Episode 416: Right next door ; Episode 417: Like water for murder ; Episode 418: Admissions -- Disc 6. Episode 419: Personal foul ; Episode 420: Taxi ; Episode 421: Hostage.