#46 in the series. Grosset and Dunlap picture cover book. Author was Tom Mulvey writing under the house pseudonym "Franklin W. Dixon." Cover art by Rudy Nappi. Copyright 1967. Never revised. Lists to itself and the Detective Handbook (1959) as the last two titles. Print run 1967. Never published with a dust jacket. Clean, sturdy, square book with very good spine and minimal corner bumping. Black/white multi-pictorial endpapers. A small typed ownership label on the front pasted-down endpaper. No other writing/markings. A little storage abrasion wear on the back cover. Pinprick-sized marks at the left top of cover, and small white line visible at right top off cover from what may be residual sticker removal damage. HBA46