Two Heads of the Coin (1980)

Two Heads of the Coin is an early chose your own adventure style interactive fiction. The game is black & white, and text based. You play as a famed Victorian detective in the mould of Sherlock Holmes. Accompanied by your assistant Dr. Grimsby, you are met in the late evening by Mr. James Conway. Mr. Conway's wife Georgina has been missing for the last 2 weeks, and has he has sought out your help. You must quiz Mr. Conway on the details of his wife's past, and the peculiarities of their marriage, to determine the true fate of Georgina.