As the Federation starship Enterprise, under the command of Captain Jean-Luc Picard, waits to rendezvous with the USS Victory, Chief Engineer La Forge and Commander Data go to the holodeck to recreate a Sherlock Holmes mystery. Data, playing Holmes, has memorized all of the Holmes stories, and recognizes and solves the mystery within minutes. Frustrated, Geordi leaves the holodeck, leaving Data confused. In Ten Forward, Geordi explains that the fun is in solving the unknown; Data does not understand. Overhearing their conversation, Chief Medical Officer Dr. Pulaski asserts that Data is incapable of solving a mystery to which he does not already know the outcome. Data accepts Dr. Pulaski's challenge and invites her to join them on the holodeck. There, Geordi instructs the computer to create a unique Sherlock Holmes mystery with an adversary who is capable of defeating Data.