The Missing Chums (The Hardy Boys #4)

Published in 1928, this book measures 7 1/2" by 5" with 214 pages. "The book ranks 108th on Publishers Weekly's All-Time Bestselling Children's Book List for the United States, with 1,189,973 copies sold as of 2001. This book is one of the 'Original 10' generally considered to be the best examples of the Hardy Boys... The plot concerns the disappearance of the boys' chums, Chet and Biff, when they take a motorboat trip down the coast. When Frank and Joe finally find them, they are all captured... The book has undergone one major revision since originally published, resulting in two significantly different stories with the same title. The original title is noted for being the first Hardy Boys book in which Aunt Gertrude makes an appearance." -- Wikipedia.