Fourteen-year-old Will Burrows lives in the suburbs of London, or at least he did up until a few months ago. That's when his archaeologist father suddenly disappears. When the police fail to turn up any clues, Will takes it upon himself to search for his father. With the help of his best pal, Chester, they discover a hidden tunnel behind a bookcase in the basement. Positive that this is where his father went, Will and Chester delve into the tunnel as well, unaware of the adventure -- and horrors -- they are about to experience. .