A fast-paced adventure story, featuring a couple of resourceful kids.
Ben Tracey and his cousin Annie MacPherson, both aged 13, go on a bird-watching expedition to the north of England, where they see a man in an RAF uniform shoot a rare endangered bird. In trying to find more about this they come across a secret unauthorised weapon research project, with a plan to sell the weapon to people who would endanger thousands of lives. But this knowledge puts their own lives in danger.