At the recommendation of director Fred Niblo, whom Mundy had known in Africa, in early 1923 the producer Thomas H. Ince hired Mundy as a screenwriter. Mundy's first assignment for Ince was to write a novelization of the upcoming film, "Her Reputation"; the book was published by Bobbs-Merrill, and in England by Hutchinson under the title "The Bubble Reputation". Mundy later expressed disdain for the novel, with his biographer Peter Berresford Ellis describing it as "the worst book that Talbot ever wrote". For Ince, Mundy also produced a novelisation of a Western film, "When Trails Were New", which dealt with the interactions between Native Americans and European settlers in the Wisconsin woodlands of 1832. He later criticised the novel, with Taves describing it as "unquestionably one of Mundy's worst stories". Mundy continued to write his own stories; in December 1922, "Adventure" published Mundy's "Benefit of Doubt", which was followed by a sequel, "Treason", in January 1923. These stories involved the character of Athelstan King, and were set in the context of the Malabar rebellion which had taken place in Malabar in 1921. In December 1923, "Adventure" published Mundy's next Jimgrim story, "Mohammed's Tooth", which would later be republished as "The Hundred Days".