The House On The Cliff is the second book in the original Hardy Boys series published by Grosset & Dunlap. The book ranks 72nd on the Publishers Weekly's All-Time Bestselling Children's Book List in the United States with 1,712,433 copies sold as of 2001. This book is one of the "Original 10" Hardy Boys books and is an excellent example of the writing style used by the Stratemeyer Syndicate's writers. This style influenced many other "youth adventure series" books that the Stratemeyer Syndicate also published, including the Nancy Drew series, the Tom Swift adventure series, the Bobbsey Twins and other lesser known series. All of them used a unique writing style that made them very recognizable as Stratemeyer product.

The Tower Treasure is the first volume in the original Hardy Boys series published by Grosset & Dunlap. The book ranks 55th on Publishers Weekly's All-Time Bestselling Children's Book List for the United States, with 2,209,774 copies sold as of 2001. This book is one of the "Original 10", generally considered by historians and critics of children's literature to be the best examples of all the Hardy Boys, and Stratemeyer Syndicate, writing.