Along with 2 essays that offer practical insights about performing excellent mentalism, Deep Mental Mysteries features two of Larry Hass's go-to pieces of mentalism that have been honed through hundreds of performances in real-world contexts.

"Test Conditions Mind Reading" offers a fully-realized theatrical experience of mind reading. A random audience member THINKS of any playing card and you, without pumping or stooging, name it.

"The Intuition Test" is a borrowed deck, magician-fooling, close-up, after-dinner card mystery. One reviewer said this routine was alone worth the price of the book.

Reviews:
Bob Carnathan, The Linking Ring, December 2013: "Highly recommended."

Joshua Kane, M-U-M Magazine, June 2013: "Deep Mental Mysteries is an excellent value. It contains two strong effects with a mental flavor and two thoughtful essays. . . . [F]ans of Hass will want to pick this up and those new to his work will find food for thought. Enjoy."

Peter Duffie, MAGIC Magazine, June 2013: "This new collection of essays and effects by Lawrence Hass will get you thinking—and practicing."

Jay Fortune, MagicSeen Magazine, March 2013: "Hass's thinking on these matters should be required reading for magicians and mentalists alike. . . ."

Jeff Stone, Stone Cold Magic, December 2012: “If you want some seriously thought-provoking material, some depth on depth, and a small handful of excellent, powerful, baffling, and mysterious effects, then BAM!! Final Verdict: 5 Stars with a Stone Status of Complete and Total GEM!”