The curious affair of the somnambulist and the psychic thief / Lisa Tuttle.

For several years, Miss Lane was companion, collaborator and friend to the lady known to the Psychical Society only as Miss X; but then she discovered that Miss X was actually a fraud. Now Miss Lane works with Mr Jasper Jesperson as a consulting detective, though the cases are not as plentiful as they might be, and money is getting tight - until a wife's concern for her husband's nocturnal ramblings piques their interest. But there's more to it than an oblivious somnambulist, for mediums are disappearing all over London, and the Psychical Society suspects the supernatural. There is only one team with the imagination and intelligence to uncover the nefarious purpose behind the vanished psychics and the somnambulist's wanderings. Jesperson and Lane: at your service.

Adult.