Blood and Stone

When his friend Jason Thayer disappears after heading to his home town to attend a wedding, the only clue Alastair Stone has is a cryptic phone message about "something weird" Jason saw shortly before he vanished.

Stone travels to the picturesque tourist town where Jason was last seen and is soon caught up in a horrific web of murder, malevolent magic, and a mysterious and ancient force that's resurfaced even more powerful than ever after a long dormancy.

What is it, how is it connected to the town and its residents, and why has it returned now? What does it want with Jason?