Think of History as a living organism, with its own defence mechanisms. History will not permit anything to change events that have already taken place. If History thinks, even for one moment, that that is about to occur, then it will, without hesitation, eliminate the threatening virus. Or historian, as we like to call them.

We may have looked like a couple of poor but honest shop girls, but the amount of weaponry we had stashed around our persons was considerable. Although if the combined forces of H Division, the City of London police, and Scotland Yard themselves had failed to catch the RIpper, there was very little chance of us doing so.