 Walter Ames collapses at the square of Aidensfield and dies. When the police search his cottage for names of relatives they find something much more interesting; complete plans for serious crimes. All crimes have all been committed except one, and they were all planned by someone known only as "The Bookman" by Scotland Yard. The remaining crime is a hit on the Bank in Ashfordly. To prevent the robbery the police keep an eye on all newcomers in the area. Vernon Scripps has a new venture. Scripps  Roaming Holidays, where tourists can rent a gipsy caravan and drive along given routes through the country. The horse is even very easy to handle as long as you keep it away from Ashfordly Hall - and a few other places.. PPC Nicholson gets very attentive when an attractive woman asks for Sergeant Craddock at the police station, but PC Ventress thinks he may better tend to Mrs. Craddock himself.