The Fourth Door

In a gripping mystery, Jessica Standish is murdered with an oriental dagger, and her brother witnesses her former fiancé, Arthur Caldon, fleeing the scene. As Inspector Betteridge investigates, he discovers that the dagger belonged to the missing Arthur, whose cottage suspiciously burns down the same night. The plot thickens with the involvement of Arthur's estranged twin brother, Drake Caldon, his enchanting wife Elva, and their estate manager Barry Wood, leading to further twists when Elva herself vanishes.