The rebranding of the annual Fire Department Fun Run as the Billings Group Sprint Triathlon Series is just the latest battle in the war to transform sleepy Morgansburg, NY, into the next Silicon Valley. But surely even the redoubtable descendants of Colonel Obadiah Morgan, who repelled the Redcoats with no more weapon than a hip-bath, couldn't be capable of making a hi-flying tech investor vanish in the middle of a lake, in full view of a score of witnesses. But someone did, and Mary Watson, local librarian and computer genius, has the pictures to prove it. Mary Watson—yes, that really is her name—is a 40-something librarian whose two passions are Jeopardy! and coding an AI program named Doyle to write mysteries. So far, Doyle's loftiest success has been tracking down several missing library books, but Mary and Doyle are asked to join the search for the missing man by Mack Byrne, the taciturn Chief of Campus Security—and the closest thing to law enforcement there is in Morgansburg.