Two men are killed, and in both instances, their organs are mysteriously delivered to hospitals minutes before they are needed for transplant surgery. Sam and the team profile the murders and determine their suspect is someone who was probably an organ recipient in the past. Now he is returning the favor by providing organs for people with his same rare blood type. Eventually, the team sets up a sting that draws out the killer and culminates in the man committing suicide so that one last time, he can pass on the gift of life. Art Behar, Bailey's boss, sets him up to take a fall in a witness tampering scandal. John, Marcus, and George find the evidence that clears Bailey and nails Behar once and for all. Jack is displeased when he learns Sharon has struck up a friendship with the proprietor of a local newsstand. He ultimately kills the man to assert to Sharon that he is her one and ONLY friend. Chloe is followed by a man who continues to take her photograph. By episode end, it is learned that the man is a private investigator who has been hired by Sam's in-laws. The photographs will be used by the in-laws when they ultimately challenge Sam for Chloe's custody.