The Man in Lower Ten: 2nd Mary Roberts Rinehart Mystery (Unabridged‪)‬

Considered "The American Agatha Christie", Rinehart outsold Christie in their mutual lifetime through 1958 when she died. Her first book, The Circular Staircase, may have paved the way for The Mysterious Affair at Styles as the second does Agatha's Tommy and Tuppence series, which combined a thriller and mystery with a love match.