In the final volume of the thrilling dark fantasy trilogy, the Obsidian Heart, Alex Locke is still searching for his missing daughter. He is transported far into the future and then back into the past and the horrors of the First World War trenches, as gradually he pieces together the strange truth about the obsidian heart and his lost daughter.

Mark Morris has written over twenty-five novels, including four books in the popular Doctor Who range. He is also the author of two short story collections and several novellas. His short fiction, articles and reviews have appeared in a wide variety of anthologies and magazines, and he is editor of Cinema Macabre, a book of horror movie essays for which he won the 2007 British Fantasy Award.