Rent Blood Brothers: The Sign of Seven Trilogy (Sign of Seven)

In the small village of Hawkins Hollow, three best friends who share the same birthday sneak off into the woods for a sleepover the evening before turning 10. But a night of pre-pubescent celebration turns into a night of horror as their blood brother oath unleashes a three-hundred year curse.

Twenty-one years later, Cal Hawkins and his friends have seen their town plagued by a week of unexplainable evil events two more times - every seven years. With the clock winding down on the third set of seven years, someone else has taken an interest in the town's folklore. Quinn is a well known scholar of local legends, and despite Cal's protests, insists on delving in the mystery. But when the first signs of evil appear months early, it's not only the town Cal tries to protect, but also his heart.