Supernatural. Ordinary sacrifices

Sam and Dean Winchesters have been spent on the road all their lives, hunting for supernatural monsters. For many years, the brothers experienced dozens of
bloody adventures. They had to deal with a variety of creatures: from the yellow -eyed demon who killed their mother, to vampires, ghosts, werewolves, fallen angels and deities. Traveling around America and struggling with evil spirits, they gain allies - both among the
people and among the inhabitants of the other world. But each threat eliminated opens a new door for evil forces ...
Something strange is happening in the town of Braunsdale, Kentukki: travelers passing through these places disappear without a trace. Locals claim that people disappear in huge caves near the city. Their visit without a conductor is dangerous, you can never get out. Sam and Dean do not believe in this version, and when two young girls disappear in Braunsdale, they accept for the investigation.
While the brothers hunt for something ominous in the mammoth cave, it turns out that someone is protecting a terrible secret and For the sake of preserving the secrets, he is ready to kill the hard drives.
The book of the book unfolds during the tenth season, between the episodes Hunting Games and Stop and Gori