As described in a review in a contemporary film magazine: Young authoress Ruth Winton (Mason) finally succeeds in getting book publisher Murdock (von Meter) to read her manuscript for a new mystery novel titled The Great Diamond Mystery and he agrees to publish it, claiming it is for her sake as the company's committee has turned it down.

Perry Standish (Collier), her sweetheart, takes her to meet his wealthy uncle who is so enraged he cuts him off.

Believing the murder will return to the scene of the crime, which is a claim of her novel, Ruth rents Grave’s house.

He keeps hunting around the mantels, finally knocking over a clock in which Graves has hidden diamonds.

Perry, who is about to be executed for the crime, is pardoned by the governor in the nick of time and finds happiness with Ruth.