A celebrated English stage actor must prove an ingénue innocent of murder in this classic Golden Age mystery. A touring troupe of actors has come to the English village of Peridu to stage a play featuring promising young star Martella Baring. But it's not the show that has everyone talking after Martella is found beside the body of the troupe manger's wife . . . Actor and theater owner Sir John Saumarez recommended Martella for her role. So when he hears the news of the grisly murder, he rushes to Martella's trial. He's convinced the actress is innocent, but the jury believes otherwise. Enlisting the help of his friends—stage manager Nello Markham and his wife, Doucie—Sir John races to save Martella from the gallows and thrust the real killer into the spotlight . . . Originally published in 1928, Enter Sir John was adapted into the 1930 British feature film Murder!, co-written and directed by Alfred Hitchcock.