Titles include #1 The Secret of the Old Clock, #3 The Bungalow Mystery, #4 The Mystery At Lilac Inn, #5 The Secret of Shadow Ranch, #6 The Secret of Redgate Farm, #10 Password To Lakespur Lane, #11 The Clue of the Broken Locket, #13 The Mystery of the Ivory Charm, #24 The Clue In The Old Album, and #48 The Crooked Banister. All are HC, and in good condition.