The Pig Society (Aware Press 1970) and The Underground Lifestyles Handbook (Aware Press 1970) are two non-fiction titles allegedly written by Dean and his wife, Gerda. According to Stu Weaver's Dean Koontz page, "Koontz disputes authorship, claiming the publisher took liberties with the manuscript. One has only to read the first few pages to realize that a good portion of the book is, in fact, not written by Koontz. It is reported that Dean refuses to autograph the book for this reason." Each of these books are among the very most difficult of Koontz titles to locate. Finding one in good condition is a tough task.

From www.deankoontz.com:

UNAUTHORIZED MUTILATION OF DEAN’S WORKS.
In 1969, Dean agreed to have a small publisher publish two of his non-fiction works (one entitled THE SICK SOCIETY and the other entitled GOING UNDERGROUND) and two of his fiction works (one entitled HUNG and the other entitled TIGER 650). All four books were presented to the publisher as finished manuscripts and Dean fully expected for them to be published in the form submitted to the publisher. Unfortunately, all four books were put into production before Dean learned that the publisher had arranged, without Dean’s knowledge or consent, for them to be so completely rewritten that none of them, as published, bore much resemblance to the original manuscripts as submitted by Dean. Although he wasn’t able to stop publication, he did get the publisher to contractually agree to publish all four books under a pseudonym. The publisher further agreed to indemnify Dean against claims arising from the material added by the publisher: “Author and Publisher acknowledge that…the Work will be published with material changes from the original manuscripts of same, that the Publisher assumes all liability for the content of those new chapters and passages.” However, only one of the four books was published under a pen name- HUNG was published under the pen name Leonard Chris. THE SICK SOCIETY manuscript was published under the title PIG SOCIETY, the GOING UNDERGROUND manuscript was published under the title THE UNDERGROUND LIFESTYLES HANDBOOK, and the TIGER 650 manuscript was published under the title BOUNCE GIRL- all with Dean and Gerda Koontz as the credited authors, and therefore in breach of Dean’s contract with the publisher. Copyright Office files on all four of these books now reflects affidavits from Gerda and Dean stating that (1) Gerda did not participate in writing any portion of these books and (2) Dean disavows any claim of authorship or responsibility for the content of these four books due to the substantial nature of the unauthorized changes to his original manuscripts.

Interestingly, in 1971, in an article entitled "Dean's Drive or Some Days in the Life of another Writer," published in Energumen 8(June 1971), Dean allegedly had this to say about The Pig Society:



Below are my copies of the books: