This book was a discarded library book my grandmother got from a teacher friend. I read it in the early 90s and I think the art looked like something from the 50s or 60s. Not many colors, lots of red, black, white, and grey.
Someone, a knight or a king, got trapped in a castle maze and was there a long time. So long that he grew lots of hair. There was something else in the castle maze too, I think it was the bad guy who trapped him.
I don’t remember many details of the story, just that I felt bad for the person being trapped in there for so long.
The one thing I do remember is the castle maze. It was printed from a birds eye view looking down. The maze took up two pages and showed various stages of a chase taking place through out it. This maze was printed on the inside cover and first page (before the title page) of the book, and in the center of the book, and on the last page and back cover.