By the end of World War II, eleven Chase titles had been published and he decided to adopt a different writing approach. All of his books to date had been compared to each other, and he wanted to move away from the American gangster scene to the London underworld that had sprung up following the end of German hostilities. He wrote "More Deadly Than the Male" under a new pseudonym, Ambrose Grant, and it was published in 1947 by Eyre and Spottiswoode, Graham Greene's publisher at that time. Alerted to Grant's new book, Greene gave it high praise as did the critics who, at the time, had no idea that Chase was the author. Contrary to rumour, the two authors did not know each other at the time, though they then became friends for the remainder of their lives, as Chase's papers and letters reveal. In the early 1960s, both men were caught up in an investment scandal involving Tom Roe which was to lead to Greene's tax exile beginning in 1966.