Sir Maurice Newbury, Gentleman Investigator for the Crown, imagines life can be a little quieter from now on after his dual success in solving The Affinity Bridge affair. But he hasn't banked on his villainous predecessor, Knox, hell bent on achieving immortality, not to mention a secret agent who isn't quite as he seems.... So continues an adventure quite unlike any other, a thrilling steampunk mystery and the second in the series of Newbury & Hobbes investigations.