Ann Burton, after delivering a secret wavelength to Jack Baker by parachuting down to the uncharted airport in the heart of the Florida everglades, has attempted to find her way back to the emergency landing field near Miami but she hasn't been in contact since, and all at the operation are growing concerned. Meanwhile, Jack, apparently falling in with the scheme to smuggle diamonds from Africa, is assisting the government secret service in gathering information on the illicit diamonds syndicate.