Miriam Monroe and John Conrad are two young scientific workers who, independently of each other, have discovered a chemical called exonite. Miriam discovered it while searching for a cure for cancer, while Conrad used it as a basis for a powerful explosive.
Ethel Barrymore
as Miriam Monroe
William B. Davidson
as John Conrad
Harry Northrup
as Albert Bernard (as Harry S. Northrup)
Frank Currier
as Randolph Monroe
William Black
as Bradford Duncan
Cecil Owen
as Eric Johansen
Frederick Truesdell
as Prof. Poole (as Fred C. Truesdell)
Redfield Clarke
as Maj. Gen. Foster (as Redfield Clark)
Rudolph De Cordova
as Williams
W.M. Armstrong
as Capt. Herbert
