The patchwork devil

London, 1919. While the world awaits the signing of the Treaty of Versailles, Holmes and Watson are called to a singular mystery.

A severed hand has been found on the banks of the Thames, a hand belonging to a soldier who supposedly died in the trenches.

But the hand is fresh, and show signs that it was recently amputated.

So how has it ended up back in London two years after its owner was killed?