When Silas Bird wakes in the dead of night, he watches powerlessly as three strangers take his father away. Silas is left shaken, scared and alone, except for the presence of his companion, Mittenwool . . . who happens to be a ghost. But then a mysterious pony shows up at his door, and Silas knows...

When Xavier wakes up on the first morning of an enforced family weekend away with his pregnant stepmum and dad, he doesn't recognise where they are - it's as if the house has inexplicably been transported to the set of a video game, inside an impenetrable dome where the family have been 'donated'...