When Claire Dunleavy buys an abandoned farmhouse on Briar Hill, she thinks she has found a broken place she can restore.
Then she discovers 666 carved behind the kitchen wall.
What begins as an unsettling renovation mystery becomes something darker when Claire, her best friend Jill, and local historian Martin Reyes uncover the story of Elliot Goss-a man obsessed with Revelation 13:18 and convinced the Number of the Beast was not a warning, but a formula.
As names appear, walls shift, and something beneath the house begins to answer, Claire realizes the number is still counting.
And this time, it has found her.
Six Hundred Sixty-Six is a gothic occult horror novel of suspense, black magick, friendship, forbidden knowledge, and the terrifying things that refuse to stay buried.