Henry and Margaret spend a day at the races with her new client Bob Bishop, who is resisting a take-over bid for his cider brewery. A mysterious man shadows Henry and then the corpse of stable lad Ben Tucker is found in a horse-box. Bob's brother Tony owns the stables, which are failing, and he is very curt with Henry when he comes to investigate. On the night he died Ben had argued with another stable lad Jerry Lawless over female jockey Jude O'Brien but he too is murdered and Bob's daughter Liz, another jockey, is found in his caravan with a bag full of bank-notes.

Liz claims the money is winnings from a bet and Henry releases her but notes that Jerry too has a healthy bank balance and surmises he was trading inside information for cash. Tony apologizes to Henry but tries to push Bob into accepting the take-over and Henry's mystery man proves to be a private eye, since Tony has been fixing races and the Jockey Club have hired him to get proof. Henry believes Tony got Jerry to nobble his horses and killed Ben when he found out. He has the correct motive but the wrong suspect and it's Margaret who literally stumbles on the real killer and has a close call with them. Meanwhile Nicola is annoyed when a spoilt school-friend appears to be making a play for Gary, though she is actually trying to poach him for her restaurant - unsuccessfully.

DI Crabbe's first job with his new team of PC Guthrie and WPC Morton is to guard a new housing development which has been subjected to vandalism. Nearby villagers claim that one of the houses is built in the path of a centuries old right of way. Henderson is in trouble for growing and selling varieties of tomatoes not approved by the E.E.C. And the new waitress in the restaurant gets the cold shoulder from Gary, who is missing the recently departed Nicola.

Henry and his team are called to a private boarding school where police Commander Colin Stilwell's son Alex has been beaten up by local youths. Henry initially encounters a wall of insular hostility from the establishment before Alex points him to another pupil, who has blackmailed the Chemistry teacher into manufacturing Ecstasy tablets, which he is selling around the school. Gary meanwhile creates a new blend of mustard and attracts the attention of a large food manufacturer who offer to market it. However, they want to alter the recipe, making it taste more bland, whereupon Gary, taking a leaf from Henry's book, puts his culinary principles first and tells them that the deal is off.

As Fisher launches a campaign to make the police more popular with young people a boy called Nicky comes to Pie in the Sky, claiming he is there for work experience. Henry uses him in the kitchen and he impresses everyone but then the till is robbed and Nicky, who was not sent by any school, goes missing. His mother last saw him a week earlier, the night an off-licence was robbed by a violent teenage gang. Henry tracks Nicky down to a childhood haunt and finds out that he was bullied into joining the gang and now regrets it, which he proves by leading them into a police trap.

The Crabbes holiday in London in a flat owned by ex-policeman Nick Spencer whilst he is in America on business. However Margaret finds his packed suitcase under the bed and hears an answer-machine message from his daughter warning that her violent ex-con boyfriend Danny is on his way to see him. Henry discovers Nick in hiding whilst Margaret discovers Danny's corpse in the dust-bin, killed in self-defence by Nick. Henry's loyalty is put to the test, as is the patience of Sally and Gary when the agency staff turn out to be a quarrelsome married couple.

As Henry mysteriously loses his sense of smell he is intrigued when Fisher seems obsessed with arresting tyre exporter Peter Watson and suspects that Fisher, about to divorce his wife, is having an affair with Mrs. Watson. In fact she has discovered that her husband is defrauding her charity and is using Fisher to trap him. Having seen the case through Henry, feeling used by Fisher to catch Watson, resigns from the police and immediately regains his sense of smell. With Gary turning down the offer of work at another kitchen, Henry and his staff and colleagues have every reason to drink to the continuing success of Pie in the Sky.