York, 1377. A costly gold lion made by the city's goldsmiths as a coronation gift for Richard II is stolen, and Owen Archer is asked to recover it before the loss disgraces the guild. The investigation begins as attacks by French and Spanish ships fuel rumours that foreign merchants in York are passing intelligence to England's enemies.
A drowned man and the torture and murder of a suspected spy raise the possibility that the theft is linked to a wider network of betrayal. Owen must decide whether one criminal is responsible for both the missing lion and the killings, following the evidence through merchant rivalries and guarded personal histories towards one of the most powerful men in the kingdom.