The Gatehouse Mystery and The Red Trailer Mystery have several repairs with book book binding tape. The spines have been repaired and a couple pages at the front and back covers have been repaired. No repairs to the reading pages and no pages are missing. They are still very readable books but they are vintage and they do have some tanning. These are both 1954 editions. The Secret of the Mansion is in better condition but there is some clear book binding tape on the outer spine of it also. This book is a 1970 edition. There maybe some torn page corners or some names written in the books. Neither interferes with the reading of the book. I have tried to picture or tell about any problems. Please see photos!