In Whitechapel, a renowned Italian escape artist dies spectacularly on stage during a performance – immolated in a gleaming copper cauldron of his wife’s design. In Cambridge, the runaway daughter of a famous don drowns, her long blonde hair tangled in the Jesus Lock on the River Cam. And in Baker Street, a malevolent locksmith exacts an unusual price to open a small silver box sent to Watson.

From the glow of the London stage to the buzzing Cavendish Laboratory in Cambridge, where physicists explore the edges of new science of electricity, Holmes and Watson race between the two cities to solve the murders, encountering prevaricating prestidigitators, philandering physicists and murderous mentalists, all the while unlocking secrets which may be best left undisclosed. And one, in particular, lands very close to home.