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Sarah Lotz: Day four (2015, Hodder Headline)

Sarah Lotz's extraordinary, unmissable follow-up to the book that made headlines around the world, THE …

Review of 'Day four' on 'Goodreads'

I liked it better than "The Three". More like "in the same universe" than a sequel to it.
There are more things happening. The threats and suspense is less nebulous and distant. Maybe that's because of the setting — the Cruise To Hell — the characters are more close.