Reddit reviews Supernatural: Witch's Canyon (Supernatural Series)
We found 2 Reddit comments about Supernatural: Witch's Canyon (Supernatural Series). Here are the top ones, ranked by their Reddit score.
http://www.amazon.ca/Supernatural-Witchs-Canyon-Jeff-Mariotte/dp/0061370916
There are several books.
Nevermore: http://www.amazon.com/Supernatural-Nevermore-Keith-R-DeCandido/dp/0061370908/
Bone Key: http://www.amazon.com/Supernatural-Bone-Keith-R-Decandido/dp/0061435031/
Witch's Canyon: http://www.amazon.com/Supernatural-Witchs-Canyon-Jeff-Mariotte/dp/0061370916/
And a few more. They tend to be on larger scale than the tv episodes and there are usually a lot more deaths before the boys figure it out.