"On the island of Madagascar off the eastern coast of Africa, there's a very large, very odd rock near a small lake. Locals know not to go too near the rock and swear it shocks them if they get close. They also see a bad-tempered old woman around the rock quite often--and no one likes to get anywhere near HER. In fact, the large rock conceals a hideaway where Grace Cahill keeps all her darkest secrets...and some of her saddest memories."