Darker London-Uncover what is underneath...

The carpet fibers stuck to the tape in the package John Doe had sent to the London Police, would eventually lead back to Kaufmann's Rug Factory, which was long since abandoned. The fibers were unmistakeable, as time was, Kaufmann's was the only place left in London to sell carpet dyed organically and not synthetically. The dye still ran, especially when exposed to chemicals. And John had no doubt the clues would lead the cops here to the factory. Though clearly he wasn't worried about it leading them there quickly, as he walked slowly around one of the dye vats, knocking his gloved fist against it occasionally.

( The Lord is my Shepherd. )