Captain John Staple returns from the Napoleonic Wars unable to settle into a quiet civilian life. Lost in the Pennines, he reaches an isolated toll-house whose keeper has disappeared and takes temporary charge, hoping to discover what happened.
His investigation connects the missing man with a nearby estate, a concealed fortune, a murder and a criminal gang. John’s growing attachment to Nell Stornaway gives the mystery a personal stake, while his military confidence is tested in a world of smugglers and local conspirators.