Book 1: Star trek 2. Arena. A taste of Armageddon. Tomorrow is yesterday. Errand of mercy. Court martial. Operation: annihilate! The city on the edge of forever. Space seed.--Book 2: Star trek 3. The trouble with tribbles. The last gunfight. The doomsday machine. Assignment: Earth. Mirror, mirror. Friday's child. Amok time.--Book 3: Star trek 8. Spock's brain. The enemy within. Catspaw. Where no man has gone before. Wolf in the fold. For the world is hollow and I have touched the sky.