Sign of seven trilogy

"In the town of Hawkins Hollow, it's called The Seven. Every seven years, on the seventh day of the seventh month, strange things happen. It began when three young boys -- Caleb, Fox, and Gage -- went on a camping trip to The Pagan Stone... It is only February, but Caleb Hawkins -- descendant of the town founders -- has already seen and felt the stirrings of evil. Though he can never forget the beginning of the terror in the woods twenty-one years...

At ten years of age, Gage Turner and his friends unleash an ancient, powerful force when they spill blood over a pagan stone. Years later, Gabe returns to his hometown to help his childhood friends and the women bound to them by fate halt the demonic forces that have ravaged the town every seven years.