It is written by John Passaralla. From the Amazon description:
When a gruesome murder takes place in Braden Heights, Indiana, the local authorities suspect the disemboweled and eyeless corpse is the result of an animal attack. But when another body is discovered, the eyes gouged out, Sam, Dean and Castiel start looking for connections between the victims—and discover both men were soon-to-be fathers. As the boys hunt the killer, they unearth the town’s troubled past, and secrets some would prefer stay buried forever.
A brand-new Supernatural novel, set during season 10, that reveals a previously unseen adventure for the Winchester brothers, from the hit CW series!
It's been a while since we have had a tie-in novel. Cold Fire can be purchased at Amazon using this direct link (button):