Bill Holmes ( Matty Kemp ) rescues Rinty ( Rin-Tin-Tin ) from a car wreck not realizing that there is a stolen $50,000 diamond necklace hidden in the dog's collar. He discovers this fact when he falls into the hands of a criminal gang. Mary French ( Evelyn Pierce ), a member of the gang but sick of it all, and Rinty help him escape, and with the reward money the young lovers begin their honeymoon.