London. July, 1399. As rumours spread that his ambitious cousin, Henry Bolingbroke, has returned from exile in France, King Richard's grip on the English throne grows ever more precarious. Meanwhile, the body of a young woman is discovered at Dowgate sluice. When it's established that the dead woman was a novice from nearby Barking Abbey, the coroner calls in his friend, Brother Chandler, to investigate.

Who would cut the throat of a young nun and throw her remains in the river? And what was she doing outside the confines of the priory in the first place? Secretly acting as a spy for Henry Bolingbroke, Chandler is torn by conflicting loyalties and agonising self-doubt. As the king's cousin marches towards Wales and England teeters on the brink of civil war, Chandler's investigations will draw him into affairs of state - and endanger not only himself but all those around him.