The Bobbsey Twins At Mystery Mansion written by Laura Lee Hope.   Published by Grosset and Dunlap, New York and printed in the U.S.A. in 1945. Hardcover book, 215 printed pages.

Synopsis: The Bobbsey Twins and their family goes on a vacation to Lakeport, where they stay at the Mystery Mansion, a large and somewhat spooky house owned by an elderly widow, Mrs. Marden. While at Mystery Mansion, the twins encounter mysterious occurrences, such as strange noises and disappearing objects. They also hear rumors of hidden treasure somewhere in the mansion. Determined to solve the mystery, the Bobbsey Twins explore the mansion and its surroundings, uncovering clues that lead them closer to the truth.Throughout their adventure, the twins demonstrate bravery, teamwork, and resourcefulness as they unravel the secrets of Mystery Mansion and ultimately uncover the hidden treasure.

The book is in overall good condition.  The front cover and top and bottom of the green cloth on the spine have some signs of wear and wear marks (see photos). There is a name written on the inside of the front cover on a bookplate.  The inner pages have some light yellowing due to age, and a few of the pages have light stains (see photos).