Destination Unknown. by Christie, Agatha - 1954

London: The Crime Club by Collins, 1954. Hilary Craven, a deserted wife and bereaved mother, is planning suicide in a Moroccan hotel, when she is asked by British secret agent Jessop to undertake a dangerous mission as an alternative to taking an overdose of sleeping pills. The task, which she accepts, is to impersonate the wife of Thomas Betterton, a nuclear scientist who has disappeared and may have defected to the Soviet Union. Soon she finds herself in a group of oddly-assorted travelers being transported to the unknown destination of the title which turns out to be a secret scientific research facility disguised as a modern leper colony and medical research center at a remote location in the Atlas Mountains. Destination Unknown is one of the five Christie novels to have not received an adaptation of any kind, the others being Death Comes as the End, Passenger to Frankfurt, They Came to Baghdad, and Postern of Fate.