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While Michele Lupo's skillful thriller is certainly Italian, it is more of a traditional mystery than most of its contemporaries. The plot is the standard one involving greedy heirs being killed off in a country house following the reading of a will. Daughter Anna Moffo gets everything, and before too long, the cast starts dropping like flies. Ida Galli, Giacomo Rossi-Stuart, and sexy maid Orchidea DeSantis are among the suspects and victims, while Lance Percival and Gastone Moschin appear as comic-relief cops from Scotland Yard. The ending is fairly clever, although regular followers of the form may find it a bit obvious.