John Rawlings, Apothecary

Apothecary John Rawlings has travelled to Devon to be by the side of his mistress, Elizabeth di Lorenzi, who is due to give birth to their child. Leaving his shop and his new carbonated water business in good hands, John is presented with a surprise on his arrival at Sidmouth House. While Elizabeth is recuperating, he learns that Lady Sidmouth's daughter, Miranda, is to marry the elderly Earl of St. Austell, who is 54 years her senior and has a cruel reputation.

Apothecary John Rawlings is intrigued when a letter arrives asking him to investigate an impostor claiming to be the long-lost step-son of a wealthy Bristol merchant in possession of his dead wife's diamond inheritance. John Rawlings' father, Sir Gabriel Kent joins him on the trip to take the healing waters at Hotwell where they socialize with the crème of Bristol society. But Rawlings is compelled to try and solve the mystery and so he must trawl through the underbelly of 18th-century society.