"Your days are numbered if you do not return the secret of the jewels to its rightful owners." So reads one of the many warnings in this early sound serial from an independent studio called Metropolitan. The sought-for secret? Radioactive chains that change ordinary sand into fine jewels. An eccentric explorer discovers the chains in India, where he also acquires a puppy apparently marked by the Sign of the Wolf. Years later, with the setting now the American West, the finder of the chains and his daughter are endangered by criminals who, for obvious reasons, would like to get their hands on the valuable chains. An equally interested party is a religious sect to whom the chains are sacred. Were it not for two helpful cowboys, Tom and Bud, the beleaguered Farnums would have little chance against double competition.