Philo is in Vienna working for the US Government to see if Archer Coe is selling aircraft designs to foreign powers. He grabs the plans with Archer's signature, but is captured by police before he can escape. Deported he comes back to America and plans to confront Archer, but Archer is found dead in his locked bedroom with a gun in his hand. While it looks like a suicide, Vance knows better and the coroner finds that Archer has been shot, hit with a blunt instrument and stabbed - making suicide unlikely. But Vance is on the case and is looking to see if government secrets have been sold and who has murdered Coe. This is a remake of "The Kennel Murder Case" using aircraft designs and espionage instead of Chinese porcelain and dog shows.
James Stephenson
as Philo Vance
Margot Stevenson
as Hilda Lake
Henry O'Neill
as Markham
Edward Brophy
as Ryan
Sheila Bromley
as Doris Delafield
Ralph Forbes
as Tom McDonald
Donald Douglas
as Philip Wrede
Martin Kosleck
as Gamble
Jimmy Conlin
as Dr. Doremus - Coroner
Edward Raquello
as Eduardo Grassi
Creighton Hale
as Du Bois - Fingerprint Man
Harry Strang
as Hennessey - Markham's Assistant
