When K.C. has to find an undercover spy to pass a test for a promotion at The Organization, everyone at the Cooper's neighborhood potluck becomes a suspect. Meanwhile, Petey is on his own mission to try and scare Judy.
Public pressure on Terry and the SFPD continues to rise for the shooting death of an unarmed suspect. Hildy tracks down the fugitive in the Normandy Parker murder. Arkin advises Siletti to reconcile with his wife, as she might be the key to winning -- or losing -- his case.
An intruder breaks into the Donovan household, forcing the family closer together as Bridget struggles to maintain her independence. In Primm, Mickey schemes to rob a casino with the help of a lounge singer and a man named Ed. Meanwhile, with a baby due at any minute, Bunchy and Teresa navigate their marital woes under lockdown, and Ray visits Belikov in prison to strike a deal.
Notorious music blogger Bryce Newman (Rainn Wilson) sets his sights on the band, penning a post that eviscerates them as dull and irrelevant. When Reg invites him to the band's next show to smooth things over, the crew takes matters into their own hands. Rock legend Lindsay Buckingham appears as himself.