Yvonne and Steven visit a London hospital only to find themselves trapped inside the headquarters of an ancient Newtonian society. Their escape with the Order's secret history sets them on a perilous adventure up the canals of England, pursued by the Order's remorseless Archbishop. The best they can do for allies are a batty Marquis and his wife, ex-convicts and an unreliable demon. They have a mystery to solve, but first they must survive. novel ~ 540 pages