Readers on Amazon consider it readable at 3 - 7 Grade Level.
A popular method used by schools to measure a student reader’s ability is Lexile level or a Lexile Measure. The Lexile Level of Hardy Boys 25: The Secret Panel is 690L .
Readers of age 8 - 12 years will enjoy Hardy Boys 25: The Secret Panel .
Another exciting mystery begins for Frank and Joe when they help a stranger who has had an accident with his car. The man introduces himself as John Mead, owner of a nearby estate. But when the Hardy boys find an odd-looking house key and try to return it, they realize that John Mead died five years ago! They are even more amazed when they find that the intricately carved doors in the deserted mansion have no visible knobs or keylocks. What happens when Frank and Joe discover that there is a link between their father’s case of thieves and the mysterious Mead mansion will keep the reader on edge with thrills and suspense. Read more