This is a vintage hardcover copy of "A Three-Cornered Mystery" by Carolyn Keene, author of the popular Dana Girls series. Published by Grosset & Dunlap in 1935, this book features a dust jacket and is in its original form. The story is written in English and falls under the category of mystery literature. The book is set in the United States and is a collectible item for book enthusiasts. The title is perfect for those who love to solve mysteries and enjoy the adventures of the Dana Girls. This book is a must-have for any vintage book collector and is sure to be a great addition to your collection.