Chan is faced with suspects in a stolen atomic bomb formula case, that are being killed with bullets that are not fired from a gun.
Sidney Toler
as Charlie Chan
Fortunio Bonanova
as Insp. Luis Carvero
Benson Fong
as Tommy Chan
Robert Emmett Keane
as Alfred Wyans (as Robert E. Keane)
Willie Best
as Chattanooga Brown
Carol Hughes
as Marguerite Fontain
Marjorie Hoshelle
as Countess Irena Masak
Barton Yarborough
as Joseph Brandish
George Meeker
as Edmond Slade
Don Costello
as Charles Masack
Charles Trowbridge
as Prentiss
Mildred Boyd
as Josephine
