Worm in the Blossom - The Sam Plank Mysteries, #3

In the stifling summer of 1826, the death of a young man in Hyde Park uncovers a web of blackmail and corruption so far-reaching that even the redoubtable Constable Sam Plank is shocked. A Quaker charity hides a terrible secret, a dangerous enmity is growing between London's hackney carriage drivers and its watermen, and fraternal loyalty is tested to its limits. Susan Grossey's third Sam Plank novel plunges the magistrates' constable, his determined wife Martha and his protégé William Wilson into a dark and desperate world.