The Lone Wolf is the first of eight books in a series featuring the jewel thief turned private detective Michael Lanyard. With his identity betrayed and the police on his heels, he must fly from Paris, which is made much more difficult by his self-imposed duty to take care of the beautiful Lucia, who has a dark secret of her own...A large number of movies have been based on the books.

Mr. Philip Kirkwood, a not so successful painter, receives a visitor from his home town in America, who wants him to do him an unspecified favor, but Kirkwood doesn't trust him and sends him away. That night, he sees the stranger dine with his beautiful daughter. In order to protect the girl, the stranger confesses to Kirkwood that he expects to be arrested upon leaving the restaurant. Kirkwood agrees to take care of the girl, but when he brings her home, he knows that she is in danger and that there must be a mystery attached. He decides to protect the girl...

This is the second book in the Lone Wolf series. Michael Lanyard had turned his back on his career as gentleman-thief and started a respectable life, when World War I wrecks his life. With his family dead and the spy Ekstrom alive after all, his special skills as the Lone Wolf are needed once more, this time in the war behind enemy lines. But again, there is a mysterious woman involved...

In the beginning of his career, Michael Lanyard alias The Lone Wolf, the most talented thief of his day, made the acquaintance of the beautiful Princess Sofia, but he also made an enemy of her husband, Prince Victor. Years later, Lanyard's daughter gets into the crossfiere... Red Masquerade is the third book in the Lone Wolf Series.