From the back cover (Sypnosis/cover thanks to ultimate doctor who)

This is the Gyre - the most hostile environment in the galaxy...

250,000 years’ worth of junk floating in deep space, home to the shipwrecked Sittuun, the carnivorous Sollogs, and worst of all – the Humans. The Doctor and Amy arrive on this terrifying world in the middle of an all-out frontier war between Sittuun and Humans, and the countdown has already started. There’s a comet in the sky, and it’s on a collision course with the Gyre...

When the Doctor is kidnapped, it’s up to Amy and “galaxy-famous swashbuckler” Dirk Slipstream to save the day. But who is Slipstream, exactly? And what is he really doing here?

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