"A mutant strain of ophicordyceps unilateralis. Civilization broke down after the first three years, the following decades were just another form of treading water."

Of course, that's hindsight speaking. Had anyone told her that five days ago, she would have laughed in their face and pointed at her facility full of test subjects, all equally likely to hold the secret to a full cure - or at least immunity.

"Never mind, you will end up seeing for yourself if you should find yourself returned to where you came from." She smiles. "Assuming, of course, that our idea of London is the same, and I haven't completely misjudged what time you are from."