Osterlind, Richard: The Radar Principle ©2021 (circa) Richard Osterlind, Osterlind Mysteries Softcover, perfect-bound, 5.5x8.5", 69 pages

Image courtesy Don's Magic and Books

Comments: Covers Richard's Radar Deck, its history, how to make it, and the latest handlings and performing situations, and more.
Volume One in the Osterlind Legacy Series.

Contents (from book ToC):

7 Preface
9 The History of the Radar Deck
15 The Current Version of the Radar Deck
23 Variations of the Radar Deck
31 What is the Radar Principle?
37 Zodiac Revolution Plus
51 The Lure
57 Basics
65 Putting It All Together