The Secret Knowledge of Grown-Ups by .. Harpercollins buy used Used & Rare price $27.89 new from$21.50 shop with confidence SPECIAL SHIPPING CONSIDERATIONS FOR USED & RARE ITEMS. Please see the special considerations for shipping Used & Rare items, including extended delivery times, possible import duties & taxes. Delivered in 3-5 weeks Format: Hard cover Publisher: Turtleback Books Condition: The following ISBNs are associated with this title: ISBN - 10:0613442547 ISBN - 13:9780613442541 Seller Comments: Glued binding. 48 p. Contains: Illustrations. Intended for a juvenile audience.