Its a novel about a boy who's mom is missing and they think she was mudered because there was blood all over the front of her car, bit it was the boy's blood. He has to live with his uncle and he's picked on because he's Asian. He gets angry and breaks his cousin's dolls and the next door neighbor's window. The neighbor is a beautiful woman who does horticulture and medicine or something. He works for her and finds that her garden is magical and you can travel through a tree that was planted over the body of her late husband, Oswald. The boy also has water powers and the woman helps him develop his talents and she ends up being a repentant fallen angel and she helps him find his mom. She's like in a human zoo in Hell so the demons can shift themselves to look like her.
I originally read it as a nook book on Barnes and noble.
Added (1). Never mind! I found it! It's called, The Soul keepers by LP ching
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