When archaeologist Neil Watson unearths a long-buried mechanical figure in a Dartmoor field, he is determined to discover the truth behind the bizarre find. Soon, however, the village becomes the focus of press attention when two people are found shot dead in nearby Manor Field. DI Wesley Peterson is called in to investigate, but the murders aren't his only problem. The daughter of a local MP has gone missing. And a woman Wesley helped on a previous investigation finds herself subjected to a campaign of terror. Is there a link between the double murder and the accidental death of a young history student in Manor Field 20 years ago? And just what is the true identity of the Mechanical Devil?