The Epic Casebook - An Author's Ending

Inspector Carr was in his office when he received the news over the phone about the murder of the famous author. Carr says "Olivia Shaw has been shot dead, you say?" The constable says "Yes, sir". Carr asks "When and where?" Constable says "The call just came through, sir. At 14 Edward Terrace region". Carr says "14 Edward Terrace, right. Has any action been taken?" Constable says "Yes, sir. Sergeant Wilkins from the Marivan police station". Carr asks "Is he at the address now?" Constable says "Right. Transport has been arranged for you, sir". At the scene, Carr was met by Sergeant Wilkins who took him to the second floor where the murder took place. The dead body of Olivia Shaw was slumped across the leather inlaid desk, with a gunshot wound disfiguring the left side of her face. The window immediately behind her was splintered into star-shaped fragments spreading out from a neat hole. It was a typical author's study. Two walls of books, wood paneling, a comfortable armchair, a leather couch, and a coffee table in one corner. Sergeant Wilkins says "I was on patrol car duty, sir. I received a call to proceed here at 6:25 PM. The report indicated that a woman had locked herself in a room and would not answer the door. I was met downstairs by a maid and brought up here, sir, where Mr. Hamilton was waiting for me". Carr says "Mr. Hamilton? Well, who's he?" Wilkins says "The husband. Olivia Shaw was her writing name, sir". Carr asks "Is Mr. Hamilton here?" Wilkins says "Yes, sir. In the drawing room, downstairs". Carr says "You say the door was locked?" Wilkins says "Yes, sir. when Mr. Hamilton called us, he said his wife had been in the study all afternoon, and he was getting worried about her. He said it was urgent, as she was given to fits of extreme depression. When we arrived at the scene, we asked him why he hadn't broken down the door? He said that door was built over 100 years ago, and was solid as a rock". Carr says "You say the door was locked from the inside?" Wilkins says "It was more than that. It was bolted".