The twin brother of the city's pension fund administrator informs Nash and Joe that his sibling stole $5 million from the fund. Meanwhile, Bettina is fired when his zeal to become city supervisor goes too far; and Nash and Caitlin try to get away on a vacation to Jamaica.

Evan puts himself under suspicion after he takes $40,000 of drug money during a bust; Nash and the SIU take down a drug dealer. Nash and Joe guard a chimpanzee, while Jake Cage goes undercover as an animal extremist.