October, 1931: an anonymous telegram summons the Reverend Lucian Shaw, country parson and former army chaplain, to the deathbed of his elderly uncle in the remote Scottish Highlands. On the London to Inverness night train, Shaw chances to meet a private investigator who is later found murdered in his sleeping compartment. Realising there may be a connection with his dying uncle, Shaw is drawn into a deadly conspiracy reaching to the highest...