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.