From the back cover: In a remote area of Federation space, the Enterprise picks up an urgent distress signal - from a Klingon vessel! Tracing the S.O.S., the crew finds the Klingon cruiser Mauler, trapped in a dimensional storm of unprecedented power. Yet paradoxically, the ship refuses both the Enterprise's call and offers of help. Determined to discover what the Klingons are doing in Federation space, Kirk beams aboard their ship with a security team, just as the storm flares to its highest intensity. As the bridge crew watches in horror, Mauler vanishes from the Enterprise's viewscreen.