Yes, it is. The story of 'Slow Horses' has its roots in real - life spy scenarios. It takes inspiration from the murky world of intelligence operations where things are not always as they seem on the surface. There are often internal power struggles, moles, and complex operations just like in the story.
It's a spy thriller. It follows a group of misfit intelligence agents in a slow horses department. They deal with various espionage - related issues and often find themselves in dangerous and complex situations.
There is also River Cartwright. He is a young agent trying to find his place among the misfits in the slow horses. Another important character is Diana Taverner. She is involved in the power dynamics within the intelligence agency. These characters interact in complex ways, with their own goals and secrets that drive the plot forward in the 'slow horses novel'.
Jackson Lamb is a very notable character. He's the head of Slough House and has a rather unorthodox leadership style. He's gruff, often seems lazy, but is actually very shrewd.
Perhaps 'horses name off' is a wrong or misheard phrase. However, if we consider it as is, it could be related to a situation in a fictional world. The 'never ending story' aspect might suggest that there is a long - running tale where horses play a role, and for some reason, their names are being excluded. It could be a symbolic way of representing something in the story, like the horses being nameless to show their insignificance or to create an air of mystery around them.