Miss Marple explains that Heather Babcock's story was Marina's motive. Heather suffered from German measles, a rather harmless disease to most adults, but dangerous for a pregnant woman. Heather innocently infected Marina when she met her during the Second World War while Marina was pregnant: she had caused Marina's child to be born with mental retardation. Upon hearing Heather cheerfully tell this story, Marina was overcome with rage and deliberately poisoned her. She then spread the idea that she was the intended victim, concocting the death threats and poisoning her own coffee. Ella, who in fact made phone calls to various suspects from a phone box, accidentally guessed correctly, prompting Marina to murder her. As Marina is now dead, she will not be brought to justice. Jason confesses to Miss Marple that he had put poison in his wife's hot chocolate to save her from being prosecuted; however, the drink has not been touched. Marina is nonetheless found dead, seeming to have poisoned herself.