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Ein Toller Einfall (A 'Phantastic' Idea) features comic actor Max Adelbert as a "poor rich man," who in spite of his magnificent mansion and priceless possessions hasn't a penny in the bank. Heading to England to negotiate the sale of his mansion, he leaves the place in the care of his nephew Willy Fritsch. In Adelbert's absence, Fritsh transforms the mansion into a hotel, packing in the customers with an elaborate floor show. Naturally, this helps to put Adelbert back on his feet, leading inexorably to a happy ending. Dorothea Wieck and Ellen Schwanecke, previously teamed in the controversial Maedchen in Uniform, portray entirely different characters in Ein Toller Einfall.