Thousands are dying within the Great Wall of London as the plague really begins to bite. Meanwhile, Barnett and Waterhouse are independently pursuing their quest to uncover the truth behind the ten "missing" priests. There's also a glimpse of the Secret Brotherhood of the Rosy Cross, seen performing in their Inner Sanctum... and Maurice Waterhouse is found. Finally, is the Pope really going to be assassinated? Or will he die a natural death?