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Linus is taken from the streets simply for having done a good turn. While patrolling his usual haunt at Liverpool Street station - there are often good pickings for the homeless there - he offers to help a blind man loading a van. He wakes up feeling dreadful with vague memories of a pad soaked in anaesthetic held over his mouth and nose. It appears he's in some kind of underground bunker. A lift is the only way in and out. At first, Linus thinks he has been kidnapped for ransom - this particular street kid has a rich and famous father. But then the lift opens and a young girl appears, having been similarly drugged. Over the next few days, four more people arrive.