The Elephant Never Forgets

The Elephant Never Forgets is a 1937 thriller novel by the British writer Ethel Lina White. It was published in the United Kingdom by the Collins Crime Club and in America by Harper Brothers. White was an established mystery writer, whose novel The Wheel Spins was made into the film The Lady Vanishes the following year.

Synopsis
It portrays a group of foreigners trying to escape from the Soviet Union and the OGPU secret police of the Stalin era.