Leeds, England. July, 1893. D.I. Tom Harper is witnessing the demonstration of a devastating new naval weapon, the torpedo, at Roundhay Park. The explosion brings up a body in the lake, a rope lashed tightly around its waist.

At the same time, dredging operations in the River Aire are disrupted when a woman’s severed leg floats to the water’s surface, still clad in its stocking and boot. Could the two macabre discoveries be connected?

Harper’s investigations will lead him right to the heart of the criminal underworld that underpins the city – and into the path of a merciless killer.