When Captain Kirk and his crew are ordered to Alnath II to challenge the deadliest Klingon starship Terror, they're ready for anything -- or so they think. But the defenseless Vulcan crew of a Federation science ship has been wiped out. The remaining members of the Alnath II mission have discovered a fabulous ancient city -- but their report doesn't make sense. The Klingon battle cruiser has the Enterprise in it sights, and is ready to destroy it.

But Captain Kirk can't seem to make decisions. Spock has started to throw temper tantrums. And Checkov has disobeyed vital orders. The crew of the Enterprise are losing theier minds... one by one...all victims of ...