Richard, Door, Hunter, and De Carabas go to Earl's Court (a subway car, seen and used only by the denizens of London Below) where the Earl kicks De Carabas out of his "court" and then tells the rest of them how to find Islington. Croup and Vandemar waylay Richard and Door on the way there (on orders from their unseen client to scare them) and tell them that there is a traitor in their midst. They escape and run into the British Museum where they must find the Angelis in order to get to Islington. De Carabas makes an unexpected housecall. (thetvdb.com)