This is the sixth in a series of nine novels based on the television series "Get Smart". This book tells the story of how Maxwell Smart, and his female partner Agent 99, must join forces with V.T. Brattleboro, a agent of the villainous group known as KAOS. Their goal is to track down a powerful hypnotist Guro Optimo, and prevent him from using his powers against the world. Helping Guro Optimo, is Lucky Bucky Buckley whom took Optimo to his castle. This sixth book was released in 1967.

Get Smart, books by William Johnston, each book was originally priced at 60¢;
1. Get Smart! #T-103
2. Sorry, Chief... #T-119
3. Get Smart Once Again #T-121
4. Max Smart and the Perilous Pellets #T-140
5. Missed it by That Much! #T-154
6. And Loving It! #T-159
7. Max Smart - The Spy Who Went Out to the Cold #T-174
8. Max Smart Loses CONTROL #T-191
9. Max Smart and The Ghastly Ghost Affair #T-5326