The Little White Horse by Elizabeth Goudge
The carriage gave another lurch, and Maria Merryweather, Miss Heliotrope, and Wiggins once more fell into each other’s arms, sighed, gasped, righted themselves, and fixed their attention upon those objects which were for each of them at this trying moment the source of courage and strength.
I picked this book up on a total whim, I have the vaguest recollections of a tv series by the same name, which may or may not have existed. But if it did I think I found it boring. Still I’m a horse fan. It was cheap, and short. I gave in.