Elizabeth McQueeny joins the wagon train under the pretense of opening a finishing school out West, but Major Adams discovers her true intentions.
Reckless Gracie Bond enrolls in Mike's class for skin-diving instructors. She promptly flunks out. Vengeance bent, she invites Mike on a dive to an underwater cave. Gracie lets half the air out of Mike's tank, then waits for the chance to save his life.