Sorcha and the Vanguard are back, stranded in a city of machines, becalmed and beginning to get on each other's nerves. They don't need a maths book to tell them that questions outnumber the answers and the dangers are multiplying. Why has Raphael been waiting for them? Where are the other humans and how did they get there? Who is the mysterious Dante and why is he helping them? And how do they get home? The Replacement is the second part of the Vanguard Trilogy. "A genuinely original and genre-busting novel combining speculative, fantasy and science fiction writing to great effect" The Bookbag on The Vanguard