Gap in the Curtain Bds

Buchan's novel opens with the narrator, Sir Edward Leithen, being introduced at a house party to the brilliant physicist and mathematician professor Moe. Moe has been working on a new theory of time, and believes he has found a way of enabling people to see, as if through a 'gap in the curtain', details of a future event. He enlists several of the house party guests into an experiment.