The box contains a Tnuctipun weapon which is capable of morphing into several devices, none of which is deemed useful by the Kzinti as a war weapon. However, one setting, an energy absorber, causes a Kzinti restraint field to fail, allowing Jason and Nessus to escape with the weapon. While free, Jason manages to discover a hidden setting for a matter-to-energy conversion beam, which is far more powerful than anything possessed by either human or Kzinti. Although Nessus remains free, Jason and the weapon are recaptured by the Kzinti.