Bartimaeus, ordered to spy on Lovelace, travels to the magician Sholto Pinn's curio shop. He learns the Amulet had been under government protection before his cover is blown, and he is detained in the Tower of London. Underwood discovers and confiscates Nathaniel's summoning paraphernalia, and is called to the Tower to interrogate Bartimaeus. When Underwood returns, Nathaniel uses the scrying glass but is caught. At the Tower, Bartimaeus is unsuccessfully interrogated by Pinn and Jessica Whitwell, Minister of Security. With the help of Jabor and Faquarl, Bartimaeus escapes, on the condition that he reveal the location of the Amulet and his master. Bartimaeus flees, unwittingly leading Lovelace to the Underwood house. Lovelace, who plans to use the Amulet to seize control of the government, threatens Underwood and discovers the Amulet in his study. Nathaniel reveals himself as the thief, but his master encourages Lovelace to kill his apprentice instead of him. Lovelace's spirits destroy the house; the Underwoods perish but Bartimaeus saves Nathaniel.