After Sir Robert's injury from the battle of Waterloo begins troubling him again, his wife Lucy insists they relocate from the village of Kurland St. Mary to Bath, along with her sister Anna, so that Robert can take the waters and recover. At the Roman baths, Robert befriends an elderly and pugnacious businessman, Sir William Benson, ennobled by the Crown for his service to industry. Their acquaintance is short-lived, however, when the man is found drowned in the baths. Robert vows to find his killer, with Lucy's aid. The members of Sir William's family seem the most obvious suspects to benefit from the wealthy man's death, but his will has gone missing. To deduce who sent Sir William to a watery grave, Robert and Lucy must investigate with the utmost discretion before they too find themselves in over their heads . . .