At the train station in Mayport, Florida, Paymaster Blair Kimball (Boise De Legge) arrives a day early. Dr. A. G. Maynard (Sam Jordan), the local dentist and Constable Jed Splivins (Lions Daniels) greet him, as pilot Finley Tucker (Harold Platts) looks on.

Kimball is carrying $25,000 for the railroad payroll. Waiting with station master Thomas Sawtelle (George Colvin) in his office, Sawtelle's daughter Ruth (Kathryn Boyd) comes with her father's lunch. When she sees Finley, she asks for a ride in his new aircraft. After the flight, he proposes for the 100th time, but Ruth says she is not certain she loves him.

Captain Billy Stokes (Laurence Criner), a World War I fighter pilot, known as "The Flying Ace" because of his downing of seven enemy aircraft in France, returns home to resume his former job as a railroad detective. General manager Howard MacAndrews (R.L. Brown) assigns Stokes to find Kimball, who has gone missing along with the $25,000 company payroll, and apprehend a gang of railroad thieves.

Stokes suspects that Finley is to blame, which is confirmed when he finds Kimball alive and hidden in the tail of Finley's plane. With the help of Peg (Steve Reynolds), Stokes identifies Constable Splivins as a member of Finley's gang, and arrests him. A desperate and crazed Finley flies off with Ruth, whom he has drugged. Stokes chases Finley in his own aircraft but is afraid for Ruth's safety. Shaking his captive and reviving her, Finley says Ruth has to kiss him, or "get out and walk on a cloud."

Suddenly, Finley's aircraft catches fire but Stokes is nearby, dropping a rope ladder to Ruth, who climbs into Stokes' aircraft. Failing to put out the fire, Finley dons a parachute and jumps safely, only to be arrested on the ground. After her ordeal, Stokes comforts Ruth, and makes his feelings about her known.