A mystery story that involves the revolution in Portugal. Arnold Chetwode never intended to become involved in international intrigue. Arnold, a gently born young man in impecunious circumstances, toils as a lowly, ill-paid clerk in the prosperous London firm run by Mr. Weatherley, he is industrious but common merchant. A surprising invitation puts him at the right time and place to be a witness to a public murder. His employer and employers family are involved in the aftermath. Even Ruth, the poor invalid who befriended him when he was penniless. Full of descriptions of London settings, society, restaurants, country houses, and early motorcars, the novel careens back and forth between politics and romance. The reader is kept in complete mystery until the whole story is explained.