Vulcan!

Summary
From the back cover: Spock: beamed down to a murderous planet in a dangerously shifting universe...

A universe where a series of freak ion storms has changed the boundaries of space... where Arachne IV, inhabited by a strange race, may be lost forever to the Federation... where Spock is sent on a death-defying assignment into a war of ant-types along with a brilliant, beautiful, bigoted scientist who hates Vulcans!

Captain Kirk, Mr. Spock and the crew of the Starship Enterprise daringly journey on another thrilling mission toward the perils of unknown worlds.