Mac barely escapes death after his kidnapping and quickly goes to work trying to track down the location and identity of the bank robber. During the investigation, CSI discovers that Flack's sister may have a connection.
CSI connects two radiation poisoning deaths to a dead librarian and the rare books collection at the New York Public Library. However, the life of the medical examiner is in the balance after he comes in contact with one of the bodies.
A powerful business consultant is killed during an unrelated street party, and the motive appears to be related to her missing flash drive, which contains incriminating information against some of New York's most influential people.
A man is found dead in a basement, but the house where the death occurred is found miles away on a barge in the East River. Meanwhile, Flack discovers that his sister lost her job and has a drinking problem.
Night find the big city as two NYPD officers come upon a young man attempting to put a young woman's body in the trunk of a car. When the police go after him, the young man is impaled on a fence, leaving many unanswered questions. Stella and Det. Angel investigate the death of a pawn shop owner that reveals an old foe is back.
An environmental terrorist group bombs the home of an electronics recycler, and his daughter is killed--but the daughter is part of the terrorist group. Meanwhile, Danny considers proposing to Lindsay again.
A man is killed when he falls out a window in media mogul Robert Dunbrook's building, but did Dunbrook throw him? During the investigation, Mac discovers that the case is connected to an earlier case involving a missing flash drive.