Di Crabbe and DS Cambridge are assigned to investigate a spate of garden thefts carried out while the owners are away for a few days. It's not just a few plants that are being stolen - whole gardens are being stripped. The only person appearing to benefit is landscape designer Alan Wellbeloved, who becomes the prime suspect for the robberies. Returning home, Henry is horrified to discover that Margaret has hired Wellbeloved to redesign the restaurant's back garden to provide an outdoor dining area.

Car crime is on the rise, with most of the vehicles being stolen from the car park at the railway station. Henry's problems mount as he not only has to deal with two separate sets of thieves, but also with a hostile new female Superintendent. Things come to a head when Fisher's car is nicked at the station right under his nose. Back at the restaurant Gary and Margaret are being given a hard time by an over-zealous Food Inspector. Will she do as she is threatening and close the restaurant down?

Fisher sends Henry and the squad to a meat factory where animal rights protesters are demonstrating against the owner,Mr. Trubb's use of veal in his Trubbs' Thunderbolt sausages. However, Henry finds to his surprise that the sausages contain soya and are wholly meat-free. Margaret, meanwhile, is concerned when her friend Julia, a wealthy widow, falls for a pilot much younger than herself and agrees to finance a bucket shop for him.

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.

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.