Prologue - Chapter 4. Summary

Sir Thursday is the fourth installment of Garth Nix's The Keys to the Kingdom series. 12 year old Arthur Penhaligon has already located the first three Keys and Wills of the Architect. Now he must find the Fourth. However, the Great Maze is under attack by Nithlings and a Spirit-eater has taken over his identity and is trying to kill his family.

In the Prologue, Colonel Trabizend Nage is in charge of the garrison located at Boundary Fort, inside the Great Maze. The Great Maze is cut off from the Nothing by a seven mile long tunnel. The tunnel has four gates which are never opened at the same time. The gates are made of gold, silver, bronze and Cleargate. Col. Nage is concerned that the Nithlings on the other side of the tunnel are organizing against the people inside...