Summary: The four-year-old adopted son of a celebrity couple is kidnapped, and the team must determine if the reason has to deal with the parents' status or the boy's own Sudanese origin.

Summary: The team considers if a father who cleans crime scenes for a living led to his disappearance with his daughter.

Summary: The team searches for a missing mother who they believe may be searching for her son, who is also missing.

Summary: When a woman disappears after her boyfriend is killed by the police, the team suspects gang involvement. Later, Sam learns she's pregnant.

Summary: An office shooting forces a woman to disappear, possibly to hide a deep secret.

Summary: Malone's team joins forces with Gil Grissom, a CSI from Las Vegas, and his team as they track a serial killer with ties to New York. The crossover starts on CSI: Crime Scene Investigation S08E06 Who and What (I).

Summary: When a college student disappears after making racial remarks in a class, the team wonders if those may be directly connected to his disappearance.

Summary: The disappearance of an ultimate fighter leads the team to investigate his background, where they learn the man had a number of enemies.

Summary: The team determines if an ex-con's past criminal activity caused her to disappear after visiting a prison inmate. Det. Mars and Agent Johnson also continue their investigation.

Summary: A child prodigy turned store Santa vanishes and the team wonders if he had criminal connections.

Summary: Malone and his team start off the new year investigating how a private investigator might have went missing.

Summary: The team work on a case where a veterans-hospital worker vanishes and have two leads.

Summary: Jack goes missing after taking a case into his own hands which soon becomes intertwined with a human trafficking prostitution case that Vivian is working on.

Summary: While struggling to deal with the aftermath of Jack's accident, the team searches to find a teen heart transplant recipient, believing her disappearance might be connected to her donor. Samantha talks to Brian.

Summary: The team searches for a coma patient who had woken up after three years only to disappear.

Summary: After the latest lottery winner goes missing, the team works to figure out why.

Summary: A truck driver goes missing after saving a boy's life, and the team determines if that has anything to do with his disappearance. Meanwhile, Jack's mental health is examined by a psychiatrist.

Summary: Five people with an odd connection go missing from a coffee shop, and the team determines what the connection had to do with their disappearance. Meanwhile, Samantha gets ready for the birth of her child.