Crowdy Lobbett is a man who knows too much - and too little. As an American Judge he has for too long dealt with the evil consequences of the Simister gang and has brought many of them to justice. Furthermore, he has in his possession a clue to the identity of Simister himself. Simister follows Lobbett across the Atlantic, determined to kill him. The trail leads to the heart of the English countryside, to Mystery Mile, and a meeting with Albert Campion ...