Green and Joe Fontana, his new colleague, look into the murder of an Iraq War veteran who owned more incriminating pictures from the Abu Ghraib prison. An American citizen who is also Iraqi is accused; however, she says she is a prisoner of war.
A criminal kidnaps a child while stealing a car. McCoy negotiates with this dangerous criminal to get the child back. Fontana's previous murder case involving a young model, in which he thought the father was the murderer, is reopened as a result of a shocking confession.
The police try to uncover the truth behind a mysterious crime that took place in a photographer's apartment and began with a robbery while ending with murder.
A former NY detective, Cyrus Lupo, returns after he finds out that his brother has committed suicide. While the investigation leads him to a suspicious euthanasia network run by a famous doctor and his daughter, a similar case reveals more dark secrets.
While a mentally challenged eyewitness holds the secret to a startling riddle regarding the identity of a murderer, street fighters are prosecuted under an anti-terrorism law.
Detective Lupo's careless actions endanger a complicated investigation when he is involved in a relationship with a victim who turns out to be a key suspect in a case.
In season 21, the team continues to handle different crimes, such as partners Detective Kevin Bernard and Detective Frank Cosgrove who investigate the murder of a popular artist, and the COO of a large tech company who is found killed in Central Park.
In order to continue their investigation and expose the wrongdoings of the corrupt, the investigators are confronted with a global criminal syndicate, dishonest politicians, hate crimes, evidence theft, and blackmail.
In the twenty-third season, Detective Vincent Reilly joins the team to work alongside Detective Jalen Shaw, while the team continues their usual duties of solving mysterious crimes and enforcing the law.