The Green Helix, by E.C. Tubb (paperback)

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Over a dozen spaceships had disappeared into hyperspace, never to return. The lost vessels included the Jason, the Starbird, and the Invincible. Everyone assumed they fell victim to some kind of mechanical failure.

The mystery deepened when the Invincible turned up drifting in space six months after it vanished. The ship’s engines were undamaged, the hull intact—yet no trace remained of its crew or its two hundred passengers. Where had they gone?

Clearly something ominous had happened to the ship and the people on board.

Something in hyperspace—or somebody!