'Sign of Silence' Summary

Edward Royle, head of a well-known chemical manufacturer in England, is engaged to Phrida Shand, the daughter of his father's former partner. One night, he is summoned by his friend, Sir Digby Kemsley, a famous railroad engineer, to discuss something mysterious. Royle visits Kemsley's flat, then returns home only to be summoned again by Kemsley, this time imploring him to return at once. Royle finds a gentleman in Kemsley's place who is clearly not Kemsley, or is he? Kemsley asks Royle to trust him, but that night, a young woman is murdered at Kemsley's flat. Kemsley has disappeared. Royle discovers that his fiancé was in Kemsley's flat at the time of the murder and is obviously hiding something. Once again, Le Queux takes us through a maze of intrigue and locations in Europe.