Continuing the mission he began in 'Unification,' Starfleet Ambassador Spock endeavors to impart the logic of the Vulcan way to a small band of Romulans eager to unite the Romulan Empire and the planet Vulcan. But unbeknownst to them, a Romulan spy has joined the ranks disguised as a Unification sympathizer. Deceived by this traitor, Spock and his students are taken hostage. Fearful that Spock's knowledge of Federation security will fall into enemy hands, Starfleet dispatches its best ship, the