Great book review of "Getting the Truth" by the editor of PI Magazine​, Grace Elting Castle, in PI Magazine's March 2015 issue.  Her review ended with:

"But, my truth is, also, that I recommend this book for every PI, no matter your level of experience, or how great you believe you are at
interviewing or interrogating. It will make you think, squirm, question your past interviews and interrogations, and likely lead you to reconsider what you thought you knew about his case examples. It probably will also cause you to recommend it to others---especially those you send out from your own office to seek the truth."    

You can purchase Mr. Koenig's book, Getting the Truth by clicking "BOOKSTORE" above.