Crossover Cover: The Scarlet Impostor

In this novel by Dennis Wheatley, Gregory Sallust, who is in the CU through connections to other Wheatley characters, enlists the aid of his friend Major (formerly Captain) Jean de Brissac in a plot to overthrow Hitler. Captain Jean de Brissac previously appeared in Wheatley's non-series novel Uncharted Seas, thus bringing in that novel.