"Duty Calls" by Sandy Mitchell is a first edition mass market paperback novel published by Games Workshop, The Limited in 2007. The novel, part of the Warhammer 40000 series, is set in the Warhammer 40k universe and follows the story of Ciaphas Cain. With a focus on war and military themes, the book combines elements of science fiction and action/adventure, making it an engaging read for adult audiences. This UK-authored work of fiction, with 416 pages, is sure to captivate fans of the Warhammer 40k universe with its immersive narrative and fictional world-building.