Nine-year-old Conor’s day doesn’t start well. His right arm seems to be missing! Then he appears to have grown horns. But it’s the next event that proves fateful. His mum catches her skirt on a loose spring in the sofa.

It’s time to replace the sofa … obviously. But money is tight. So when Conor sees an old sofa bobbing in the tide as he walks to school, about to strand itself on the muddy shore, it seems like fate is working in his favour. But there’s something very strange about this particular sofa …