The unusual story of a letter that was registered by death.
A young girl falls asleep reading a murder mystery novel. She awakens at the sound of gunshots. Was it just part of her dream? She thinks it’s real enough to phone her boyfriend who is a newspaper reporter. The man is skeptical, but she is certain of what she heard, although she speculates on exactly what happened. The two snoop around, and the couple really do find that shots have been fired, and there’s a body in the house.
They only find evidence of one gunshot, although Mary heard two fired. The investigation heats up, and a suspicious letter is a key piece of the puzzle. What does the dead man’s girlfriend know? What about his house servants? A huge inheritance is at stake.
It’s the somewhat dippy Mary who figures that the missing Frank might not be dead, but just wants people to think that he is. Mary and boyfriend, Barney, continue poking around a country cottage to find signs that their missing man is living there. The two investigators find themselves locked in the cabin, and now someone has turned on the gas.
Meanwhile, the ruthless Hilda confronts Tom, and demands that letter. Does he have it? The two shady characters work a deal, but can either be trusted? Back at the cabin, Mary and Barney desperately make their break and emerge into fresh air. The ordeal has inspired Barney to figure a few things out, and he reviews more clues with Mary. There’s a sell out, and blackmail going on.
Barney begins a plan to trap the various suspects, as he poses as the dead man. In dramatic fashion, the killer shows himself, but has Barney lost control of the situation? The mystery is laid out, and the letter and other clues are explained. It isn’t looking like a happy ending for our heros, but with the confession out in the open, there’s a final twist to return control to the good guys.