Back on Earth enjoying a well-deserved shore leave, Captain Kirk is rudely accosted by a trio of Starfleet Security guards. It seems he is wanted for questioning in connection with the theft of transwarp - the Federation's newest, most advanced propulsion system. Could Captain Kirk, Starfleet's most decorated hero, be guilty of stealing top-secret technology?

With the aid of Mr. Spock, Lt. Cmdr. Piper begins a search for the scientists who developed transwarp - a search that leads her to an isolated planet, where she discovers the real - and very dangerous - traitor!