The Broken Thread by William Le Queux — Read

In the few minutes that Raife talked with Gilda Tempest in the conservatory in Mayfair, he had made his plans. They were quite discreditable to him, but he was no longer a free agent. Gilda's influence had captured him completely, and it was an influence for evil. Gilda, in turn, was entirely controlled by Doctor Malsano. They met in Paris, and theirs was the _abandon_ of a crazy infatuation, over which Doctor Malsano exercised his cunning. The wayward Raife Remington had fallen very low indeed. Hidden away in the Rue Lafayette was a small flat. It was the scene of many ugly situations; but, throughout all, the relationship of Raife and Gilda was purely platonic. He had left his wife on her wedding-day. He had abandoned himself to a scandalous life.

Doctor Malsano's gang of continental crooks worked in varying directions, and there was very little in the way of villainy that did not come within the scope of their operations, and Raife was entangled in them. Malsano, through Gilda, controlled Raife's actions. Only on one point was he firm. He refused to allow Gilda to remain the decoy, and his unconquerable firmness brought him into antagonism with the doctor, who vowed to complete the revenge that was being carried out on the son of the man who had offended forty years previously.