Doyle's wife Louisa died in 1906. After the death of his son Kingsley just before the end of the First World War, and the deaths of his brother Innes, his two brothers-in-law and his two nephews shortly after the war, Doyle sank into depression. He found solace supporting spiritualism and its attempts to find proof of existence beyond the grave. He was a member of the renowned supernatural organisation The Ghost Club.