Hellhound was written with Craig Roberts, a retired helicopter cop and decorated veteran of Vietnam. It was also the first book written by the two Allen Appels, father and son, Allen Appel III and Allen Appel IV, who are either blessed or cursed with having the same name.

 

Copies can be found in used bookstores and on the Internet using the search term Appel, Allen at http://www.abebooks.com/