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.
Charlie Chan
Insp. Luis Carvero
Tommy Chan
Alfred Wyans (as Robert E. Keane)
Chattanooga Brown
Marguerite Fontain
Countess Irena Masak
Joseph Brandish
Edmond Slade
Charles Masack
Prentiss
Josephine
Iris Ling (as Jean Wong)
Walter Dorn (as Donald Dexter Taylor)