 Sir Richard Lonsdale and his driver run a man on a scooter off the road without even stopping. The man returns the "favour" by vandalizing their car outside the Aidensfield. But the man does not stop at that. He even tries to blackmail Sir Richard, but the next morning he is found dead in his home. Murdered! David buys a used radio and by chance it also tunes in to the police channels. Aunt Peggy figures it is a good way to earn a little extra money if they listen to police radio and sell the stories to the local newspaper.