An amateur sleuth suspects foul play when a fellow passenger on a seaplane suddenly dies. The third and final film with Edna May Oliver and James Gleason as the astute schoolteacher Hildegarde Withers and the New York Police Inspector Oscar Piper busy solving crimes.
Edna May Oliver
as Hildegarde Withers
James Gleason
as Inspector Oscar Piper
Lola Lane
as Phyllis La Font
George Meeker
as Tom Kelsey, alias Roswell T. Forrest
Dorothy Libaire
as Kay Deving
Harry Ellerbe
as Marvin Deving
Chick Chandler
as Dick French
Willie Best
as Willie (as Sleep 'n' Eat)
Leo G. Carroll
as Joseph B. Tate
DeWitt Jennings
as Captain Beegle
Spencer Charters
as Chief of Police Britt
Arthur Hoyt
as Dr. O'Rourke
