Blood brothers - Nora Roberts (Sign of Seven #1)

In the town of Hawkins Hollow, it is called The Seven.

Every seven years, on the seventh day of the seventh month, strange things happen. It began when three young boys accidentally unleashed an ancient evil...

Caleb Hawkins can never forget what happened in the woods twenty-one years ago – and neither can Hawkins Hollow. For every seven years, there are a few weeks in July when the locals do unspeakable things – and then don’t seem to remember them. The collective madness has made itself known beyond the town borders, and has given Hawkins Hollow the reputation of a village possessed.

It is this modern-day legend that draws reporter and author Quinn Black to Hawkins Hollow. She hopes to make the eerie happenings the subject of her next book. Caleb Hawkins, descendant of the town founders, has agreed to talk to her. It is only February, but Cal has already seen and felt the stirrings of evil. He will need help, from his best friends Fox and Gage, and from Quinn. She has seen the signs as well and is somehow connected to the town – and to Cal. Together they will form the cornerstone of a group of men and women bound by fate, passion, and the fight against what is to come from out of the darkness...