Here's a bit about the book from Goodreads:
Whoever is born here, is doomed to stay 'til death. Whoever settles, never leaves.
Welcome to Black Spring, the seemingly picturesque Hudson Valley town haunted by the Black Rock Witch, a 17th century woman whose eyes and mouth are sewn shut. Muzzled, she walks the streets and enters your homes at will. She stands next to your bed for nights on end. Everybody knows that her eyes may never be opened.
The elders of Black Spring have virtually quarantined the town by using high-tech surveillance to prevent their curse from spreading. Frustrated with being kept in lockdown, the town's teenagers decide to break their strict regulations and go viral with the haunting, but in so doing send the town spiraling into the dark, medieval practices of the past.
This sounds uber creepy and I can't wait to get my hot little hands on a copy!
If you haven't yet, you should check this guy out. His Goodreads profile calls him a "...prodigy of the fantastic genre in The Netherlands..." and says his first book sold when he was just nineteen. More recently, his short The Day the World Turned Upside Down won the Hugo for Best Novelette!
Hex is due out in April from Tor.