A hi-flying tech investor vanishes from the middle of a lake in full view of a score of witnesses. Mary Watson, a university librarian and computer genius, has the pictures to prove it. It’ s an impossible crime with only a pair of red swim trunks for a clue, but Mary thinks she can solve this mystery with the help of her Artificial Intelligence program “ Doyle” who suggests the solution can be found in what is arguably the worst detective story ever written— S.S. van Dine’ s The Dragon Murder Case.With the university’ s security chief and a local attorney dogging her heels, and with a mysterious operative appearing out of nowhere, Mary may be in over her head.