Erich Lemke would like to marry Erika Schröder. Her father is ok with that but the mother think businessman Egon Schmitt is a better catch. She advises Egon he must buy Erika a lapis lazuli ring. Erich gets this information and understand that he must get such a stone to become Erika's husband. Strange things happen. A mysterious burglar breaks into a jeweler shop.
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