The Unhatched Egghead, 1966. Goofy and raunchy 1960s spy thriller about a teen genius. Written by Ted Mark, the author of the series The Man From O.R.G.Y..
 
🐣 Measures approx. 7" H x 4.15" W x 0.6" D. Good condition - pages toned, some light wear to covers. See images for reference, and feel free to email for more information.