When one-half of the synchronized swimming duo The Aquadolls (guest stars Nora Dunn, Wendie Malick) meets with an unfortunate end that may have been murder-by-shark, the Darling Mermaid Darlings get a chance to come out of retirement at a traveling water circus. But the surviving Aquadoll may know a little too much about Lily's past. Meanwhile, Ned, Chuck and Emerson go undercover to solve the murder.