The grand adventure continues in George Mann's Newbury & Hobbes steampunk mystery series, as a Victorian special agent races across a continent to save his beloved's life on board The Revenant Express. Sir Maurice Newbury is bereft as his trusty assistant Veronica Hobbes lies dying with a wounded heart. Newbury and Veronica's sister Amelia must take a sleeper train across Europe to St. Petersberg to claim a clockwork heart...