Like many Dick Francis thrillers, Driving Force starts with a pun. On the one hand, Freddie Croft, our hero, is the owner of a fleet of horse vans, so his driving force is carrying horses all over England, as well as to Ireland, France, and Italy. On the other hand, as mentioned several times, villainy breaks out into violence when there is a driving force compelling the perpetrator. When strange things start happening around Freddie's garages, the discovery of the driving force becomes the key to the mystery.
The chain of events is kicked off when two of Freddie's drivers pick up a hitchhiker, strictly against orders, and the man dies on them. One thing leads to another, as Freddie figures out that someone is using his trucks and drivers for their own, nefarious purposes.
The scene that really kicks the suspense into high gear is when Freddie visits his yard late one night, and it bashed on the head. Next thing he knows, he's been dumped into the ocean off the Portsmouth Docks. Once he manages to get himself out of the water and onto dry land, he has to start thinking about who might dislike him that much or be that threatened by him.
As always, Dick Francis entertains with insights into the racing scene and the cast of unique and eccentric characters who inhabit it. But who, among these happy, hoarse-loving people, might "smile and smile and be a villain?"