After serving in the Great War Émile Cairo moves to England and sets up a Private Investigations service; with close contacts with the British Secret Service and Scotland Yard, Émile Cairo is plunged into the world of the rich and powerful, solving cases of murder, political corruption, kidnapping and lost art. At every turn he comes face to face with some of the world's most evil enemies, each determined to stop him from revealing the truth, putting his life constantly in danger.