The Hardy Boys
7 books in this series
#1 Recommended
The Tower Treasure
Franklin W. Dixon
1927
#2 Recommended
The House on the Cliff
Franklin W. Dixon
1927
#5 Recommended
The Missing Chums
Franklin W. Dixon
1928
Recommended
Hunting for Hidden Gold
Franklin W. Dixon
1928
Recommended
The Shore Road Mystery
Franklin W. Dixon
1928
Recommended
The Mystery of Cabin Island
Franklin W. Dixon
1929
Recommended
The Secret of the Caves
Franklin W. Dixon
1929