The Dark Ground by Gillian Cross

Main Character: Robert
Location: England
Time period: Contemporary
Genre: YA Fiction, Fantasy
Series: The Dark Ground Trilogy #1

Robert is on a plane returning from vacation and falls asleep. When we awakens, he is in alone the midst of a large forest. Did the plane crash? Is he the only survivor? Where is the wreckage?

Robert soon learns, to his dismay, that none of his suppositions are correct and that the truth is stranger than anything he could have imagined. He is in the park close to his house, but has somehow shrunk down to such a tiny size that his world is full of unimagined danger and challenges. He is taken in by a group of others in the same predicament but while they are content to forget their old lives and merely survive, Robert is determined to find a way home.

This is an exciting survival story with a mystery that is not solved at the end of the book--what exactly happened to Robert and the others? And who is responsible?