High on a rocky promontory sat an Electric Monk on a bored horse.

The Monk gazed unblinkingly down into another valley, with which it was having a problem. The problem with the valley was this. The monk currently believed that the valley and everything in the valley and around it, including the Monk itself and the Monk's horse, was...a uniform shade of pink.

Dirk Gently's holistic detective agency, by Douglas Adams.

I would argue that this book is his best work.