Byward Tower was a Gordian knot in and of itself, in that it connected the complex’s two most important gates to its most congested corner. But that was only its ground floor. The building consisted of two circular towers bridged together, and was a favorite place to keep important prisoners. It now stood to one side of Daniel and Isaac. To their other side was the enormous, out-thrust bulk of Bell Tower, the southwestern bastion of the inner wall. But Daniel only knew this because he was a scholar who’d looked at old pictures of the place. Much more obvious were the ground-level structures built facing the street: a couple of taverns right at the base of Bell Tower, more sutlers’ shacks, and small houses and apartments heaped and jumbled against and on top of every ledge of stone that afforded purchase.