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The Feds wanted to know why the mail kept disappearing on a certain shallow stretch of the river they called the Big Muddy. So they sent Longarm, in disguise, to take a gander. On board the steamship Minnitipi, he faced a lavender coated sharpster with more than once ace up his sleeve, a traveling trio of ladies who were all more innocent on deck than in his stateroom and a smart seductive sea captain named Gloria. Soon Longarm found the only way to crack the mail case was to play a lively game of Post Office with some dangerous and desirable females.