The reading level of Hardy Boys books varies, but they are generally written at a 4th to 6th grade reading level.
The last Hardy Boys book with Callie Shaw is "The Hardy Boys #163: A Taste for Terror" which was published in 1995. Callie Shaw is a recurring character in the series as Joe Hardy's girlfriend.
Mrs. Hardy made chocolate cake for the boys after school in book 1.
Henry Kurt is in book #33 (The Yellow Feather Mystery) in the Hardy Boys series
Hardy boys
The book "The Hardy Boys: The Tower Treasure" by Franklin W. Dixon has 192 pages.
mysteries The Hardy Boys is actually a series of books - all about teen detectives, brothers Frank and Joe Hardy.
The Hardy Boys series is typically aimed at readers between 8 to 12 years old, though children as young as 7 or as old as 14 may also enjoy the books depending on their reading level and interests.
The second Hardy Boys mystery book is titled "The House on the Cliff."
In the Hardy Boys book #5, "Hunting for Hidden Gold," the boat is found at the bottom of Bitter Creek by the Hardy Boys during their investigation into the mysterious disappearance of Mr. Kenworthy.
The Hardy brothers....... Retard -____-
No one except Franklin W. Dixon wrote the series of the Hardy Boys.
Depending on your reading level, I would recommend The Door Within Trilogy.