This is the third in a series of nine novels based on the television series "Get Smart". This book tells the story of Maxwell Smart, as he begins a new mission to help protect a female cryptographer {secret code breaker} named Peaches Twelvetrees, as she tries to solve the Dooms Day Plan code, of KAOS. It is explained early on, that Max's partner Agent 99, is going on vacation and will not be able to help him in this adventure. However she does appear again at the end of the book. While Max and Peaches try to crack the code, they are pursued by the KAOS agent named I.M. Noman, whom can easily change his appearance, because of his Indian rubber face. This third book was released in April 1966, about a seven month after the television show premiered.

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-154
7. Max Smart - The Spy Who Went Out to the Cold #T-159
8. Max Smart Loses CONTROL #T-174
9. Max Smart and The Ghastly Ghost Affair #T-191