Idris spent decades running from the last war's horrors. Yet as an Intermediary, altered to navigate deep space, he's one of humanity's only weapons. He's therefore forced back into action. With a handful of allies, Idris must find something - anything - to stop the Architects' pitiless advance. But to do so, he must return to the nightmare of unspace, where his mind was broken and remade. What he discovers there will change everything. From the author of the thrilling science-fiction epic 'Children of Time'.