The Pandora Principle by Carolyn Clowes

The Enterprise investigates a Romulan Bird of Prey that has mysteriously drifted across the neutral zone into Federation space. When they find the ship empty and dead in space, Starfleet orders it brought back for study. But the ship is really a Trojan horse, with a deadly cargo on board that the Enterprise brings into the heart of the Federation. And the key to survival lies in the repressed memories of Spock's protege, Saavik, whose childhood experiences on the nigharish world Hellguard contain the secret of the Romulan plot.

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