KNOCK! KNOCK! KNOCK! "Who on earth can that be at this time of night?" asked Cornelius.  David shrugged his shoulders.  They had been going over the reports on the new vaccine's effectiveness all evening and it was past 10pm.  It could be Peggy calling, although she wouldn't do so without calling first, or Dr Sands from the DPR but highly unlikely.   "Do you want me to answer it or..." began David but Cornelius waved his hand in dismissal. "I'll go...I can't abide a mystery." Cornelius replied. "I'm coming with you" said David.  Cornelius looked through the stained glass panel of the front door to see who it was. "Hmmm, it's a young woman" said Cornelius, turning to David and raising an eyebrow in surprise. "Anyone we know?" said David. "No, but we'll soon find out" Cornelius opened the door and took a look at the young woman standing on his front porch.  She seemed familiar but he could...