 Two new anti Mysteron weapons (Mysteron detector and gun) are developed from knowledge of the Mysterons. These are shown at a conference below an African hunting lodge. The Mysterons, however, have different ideas. When the Spectrum Intelligence discover Captain Indigo s in the hands of the Mysterons, Captain Scarlet tries to stop him. However, he has a time limit; Indigo has activated the lift mechanism and nicked the master key, trapping everyone below the lodge as the elevator can t be used at the same time as the lift mechanism. Can Scarlet get the key back and reverse the direction of the lift mechanism before Captain Blue, Colonel White, Dr Giadello, General Peterson and even the World President are crushed?