It is 1889 in Memphis. Bookish heiress Millie Jean Cope is as clever as she is beautiful. Unfortunately, though adept at solving puzzles and cryptograms, she doesn't realize her new fianc ̌isn't who he claims to be but instead is a charming scoundrel. The infamous Will Tucker is presenting himself as a British gentleman, Sir William Trueck, though in reality he is a crafty criminal looking for a hidden map to a secret treasure. Pinkerton agent and part-time inventor Kyle Russell has been on Tucker's trail for years. At last Kyle believes he has Tucker cornered but he is uncertain whether the lovely woman on the con man's arm is an unsuspecting victim or willing accomplice. Finding reasons to spend time with Millie is easy. Keeping himself from falling in love with her is another issue entirely.