 Martin reappears eight years later in the book "Changes", when he returns to Chicago with Susan after the kidnap of Maggie Dresden, Susan's daughter with Dresden, with the aim of using her in a bloodline curse to destroy Dresden.He is heavily involved with the events of that book, ultimately accompanying Dresden and his team to their confrontation with the Red Court at Chichen Itza.During the climax of that battle, some of Martin's back story is finally revealed.