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.

Vincent, the lazy son of a wealthy father, travels to the country in an attempt to clean up his act. There he meets Kitty Trent, and he offers to marry her. His intention is to hold a fake ceremony, but Kitty's childhood sweetheart, Tom Wilson, finds out about this scheme and threatens Vincent at gunpoint to make the wedding a real one. Vincent does, but afterwards goes on seeing other women, neglecting his wife and, later, baby.

John Reeves, steel magnate, wagers with his son Chester that he can earn twenty dollars a week and live on it. He procures work in the office of William Hart's steel plant. Against her brother's wish, Hart's sister Muriel adopts a little boy. Hart evens up by adopting John Reeves as his father. Reeves foils James Pettison's plot to ruin Hart. Chester also makes good as a workman and wins the affection of Hart's sister. The father reveals his identity and takes Hart as a partner.