Sign of seven trilogy

Every seven years, on the seventh day of the seventh month, strange things happen, and three friends--Caleb, Fox, and Gage--must battle against evil with the women who love them by their sides.

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.