Reese and Finch must protect Lou Mitchell, a widowed retiree in his seventies who likes to spend nearly all of his time at the Venus Casino in Atlantic City. After looking into his financial records, Finch determines that Lou is nearly flat broke, but somehow he manages to gamble away thousands of dollars each day, to the tune of over $300,000 in the last six months. After checking into the shady casino owner, Makris, and some of the other elderly casino regulars, our heroes determine that Makris has been using the seniors to launder his dirty drug money. Lou was the best card shark in Atlantic City, but Makris caught him and forced him to work off his debt for cheating. Finch offers to help Lou disappear, but Lou is too attached to the hometown memories of his departed wife to ever leave. Instead, he takes matters into his own hands and vows to clean Makris's casino out. With some help from Leon Tao, Reese and Finch help Lou win over $20 million dollars at the tables, but Makris and his thugs blindside them and tie them up. After a scary showdown involving Russian roulette, Reese gets the upper hand on Makris and his thugs, saves Lou and the team, and giftwraps the casino goons for the FBI. Meanwhile, Carter is shocked when she learns that Detective Szymanski is being charged with corruption by Internal Affairs, and that Detective Beecher may have been involved in one way or another. When she discovers that the charges against Szymanski reek of HR involvement, she brings it up to the ADA prosecuting the case. However, Alonzo Quinn, the head of HR, shoots the ADA and Szymanski to cover HR's tracks.