Dead Yesterday is a mystery novel written by Mary Agnes Hamilton and published in 1916. The story revolves around the murder of a wealthy businessman named John Maitland, who is found dead in his study. The investigation is led by Detective Inspector Furnival, who must unravel the complex web of relationships and motives among the suspects, including Maitland's wife, his business partner, and his secretary. As Furnival delves deeper into the case,...