Bibi and Tina, A Serious Suspicion

Bibi and Tina buy a birthday present for Mrs. Martin at Junkshop Jack's: a necklace with a horseshoe pendant. But when she wears it, Count Falko notices that it resembles his grandmother's heirloom. And indeed, this very heirloom is missing from the castle! Could Junkshop Jack be a thief? Bibi and Tina don't believe it!