This was the second of two books released under the pseudonym Owen West
("The Funhouse" is the other; there is another author named Owen West who is
NOT Dean Koontz). It also marked the first time that Koontz used a quote
attributed to "The Book of Counted Sorrows". This title was revised,
expanded and released under his own name by Berkley in 1988. The only
hardback appearance was in a book club edition.
You have a first edition of this novel if it states
"First Jove edition published November 1981"
above "First Printing" on the copyright page.