Retired businessman F.G. Lawrence favors Philip Preston for a son-in-law; Mrs. Lawrence prefers Reggie, the Dainty Dude. There's trouble, right there. Mrs. L. becomes suspicious of a stout stranger prowling about the place and tells Mary, the husky cook, to point him out to Serena Slim, the slender sleuth. The mysterious fat man happens to be Mary's beau, so she sics Serena onto John Bouncer, Philip's fat uncle. Serena is some "shadow" and the police must be called in to stop the comedy of errors which follows. After explanations all around, Lucy nestles her pretty head on Philip's shoulder while her parents soothe Bouncer's ruffled feelings.
William Shea
as F.G. Lawrence
Flora Finch
as Serena Slim - The Slender Sleuth
Hughie Mack
as Philip Preston - Lucy's Sweetheart
Kate Price
as Mary - The Cook
Cissy Fitzgerald
as Mrs. Lawrence
Ethel Corcoran
as Lucy Lawrence - The Daughter
John T. Kelly
as John Bouncer - Philip's Uncle
Charles Brown
as Reggie - Philip's Rival
