Lindsay goes undercover in an effort to track down a rogue police officer targeting women leaving a local casino. When Detective Martin Watts, who oversees all cases out of the casino, gets word of the investigation he becomes involved much to Voight's dismay. After recent events, Burgess sets plans in motion to transfer Districts pending Platt's approval and Mouse attempts to lift Ruzek's spirits by offering to set him up with a friend. Meanwhile, Antonio volunteers to take Roman's place in the upcoming boxing match against Jimmy from Firehouse 51.