A Stranger In The Mirror Novel By Sidney Sheldon. A Stranger in the Mirror is a 1976 novel written by Sidney Sheldon. The novel is one of the earliest of Sheldon's works, but contains the typical Sheldon fast-paced narration and several narrative techniques, with the exception of a twist ending. The novel tells the life story of two fictitious Hollywood celebrities. Toby Temple and Jill Castle and portrays the emotional extremes of success and failure and how people inevitably become victims of time.