Mindshadow (Star Trek, No 27)
The tranquil planet of Aritani has suddenly come under attack by a vicious and unknown enemy. The U.S.S.EnterpriseTMrallies to the scene, only to plunge into a deadly nightmare: Spock is found mysteriously injured, his mental powers crippled and weak, and Kirk uncovers an evil Romulan plot -- with a cunning double agent in the middle.  Kirk strives to expose the agent, but only Spock's knowledge can stop the Romulans.