Shadows Along the Thames. Arthur Bell Mystery Series, #2

The river keeps its secrets. Until it doesn't. A corpse surfaces along the Thames, bearing marks that suggest careful planning rather than chance. When another follows, Arthur Bell realizes someone is using the river as both weapon and message. From dockyards to drawing rooms, Bell uncovers a pattern that ties power, profit, and murder together - and points toward a killer protected by influence far above his own.
To stop the deaths, Bell must expose what London's elite are willing to drown. An Arthur Bell Mystery (Book Two).