Scott, there with his new wife Moira, is the best friend of another guest, Major John Porter. Both men are big-game hunters. Mrs Iris Staverton arrives. Rumour says she had a relationship in Africa with Richard Scott. Also present is Lady Cynthia Drage, a gossipy society woman, and the popular, young Captain Jimmy Allenson, and whom Lady Cynthia met in Egypt the previous year – where the Scotts met and married. The house is said to be haunted by the ghost of a cavalier who was killed by his wife's roundhead lover. The two fled the house but, looking back, saw the image of the cavalier looking at them from an upstairs window. The glass has been replaced many times but the image always returns on the new pane. The Scotts stay in this room, with the offending window panelled over. Satterthwaite shows this window to Major Porter from a grassy knoll some distance from the house where the image is clear. Major Porter confides to Satterthwaite that Mrs Staverton ought not to have come to the party. They overhear Mrs Staverton telling Richard Scott that he will be sorry, and that jealousy can drive a man to murder. That evening, Mrs Unkerton tells Satterthwaite that she has sent for a glazier to replace the haunted pane of glass. Satterthwaite realises that she senses the tension in the house. The next evening, Satterthwaite and Porter retrace their steps in the dusk to the grassy knoll and conclude that the glass is not yet replaced, as the cavalier's image is still there. Returning, they hear two gunshots, and find Mrs Staverton at the privy garden holding a gun and two dead people on the ground – Captain Allenson, shot in the chest, and Mrs Scott, shot in the back. Mrs Staverton says that she arrived in the garden and picked up the discarded gun. While the police are fetched, Satterthwaite notices a spot of blood on the earlobe of Mrs Scott and sees that one of her earrings has been torn away. The situation looks bad for Mrs Staverton in the eyes of the police. In the middle of the enquiry, Mr Quin arrives. Satterthwaite describes his ability to help people see problems from new angles. Prompted by Quin, Satterthwaite points out the torn earlobe, which leads to a new analysis of the gunshots. The first bullet passed through Moira into