The disappearance of the wealthy Miss Harding opens a problem for Tommy Grant, police reporter of The Chronicle. The only clue is a letter demanding ransom, but by clever detective work Grant succeeds in placing the blame for the crime on the shoulders of Miss Carter, the Harding private secretary. But her accomplice, the butler, spirits the kidnapped girl away and boards a tug headed down the bay to catch the liner Trieste. Grant arrives at the docks too late, but when wireless inquiries inform him that the butler and girl have boarded the Trieste off Sandy Hook, he speeds to the aeroplane sheds and sets out in pursuit of the liner. A thrilling chase by air, with the camera following in another aeroplane brings us to the climax when Grant by a leap through the air reaches the ship's ladder.

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