Schoolteacher Barry Jackson's wife Sophie is very ill and not capable of driving a car because of it. Nevertheless she takes the car one day and causes a bit of mayhem in Aidensfield. Soon afterwards Jackson receives threatening letters, and during a school concert somebody sets his house on fire killing Sophie. Malcolm Brown checks into the Aidensfield Arms with his daughter Vicki, but Gina suspects that that something is wrong with them. Apart from that there is an extra resident at the pub - a carrier pigeon, and Gina soon discovers it is very fast bird indeed and they challenge Greengrass to a pigeon race.