When a transporter experiment goes horribly awry, suddenly there are two Mr. Spocks! One is the true First Officer of the Enterprise. The other is his complete opposite, a traitor whose very existence poses a grave threat to the crew, the ship, and the Federation itself. One of the Spocks must die. But which one?
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Paperback, fair condition. Sticker damage to cover and spine. Wear to cover edges. Slight creasing on spine. Age-related yellowing to pages. Binding is in tact.
Published by Bantam Books, 1970. First paperback edition, second printing.