Mr. Walden, He Die, I Clean Room

S11 E8: When Larry hires a private investigator to follow Lyndsey, he tracks her to the beach house. But when Larry thinks that she's having an affair with Walden, Alan has to figure out how to clear Walden's name without outing himself. Recurring guest star MELANIE LYNSKEY returns as the neighborhood stalker Rose, who offers to help Walden out of his dilemma.