Solving mysteries is a risky business. But no mystery is too big for Holly, Miranda and Peter . . .
London is teeming with spies - and Holly Adams and Miranda Hunt are just the people to catch them. All they need is practice. Who is the sinister man lurking outside Holly's house in the dead of night? What does Miranda's mum really do for the government? Then they spot a suspicious-looking boy - and the real mystery begins . . .
