Karen Pearson: 2 books

Hope Fullerton-Smith's problems are adding up. A psychopath on the loose in her neighbourhood. A delinquent foster brother out to get her. A mute Russian girl sharing her bedroom. Hope's new roommate, Vera, is weird. She can't speak and she has horrible nightmares. But she gets under Hope's...

When Vika finds a rare black phantom crystal while caving she's not the only one who feels its pull. The school bullies kidnap her little brother and demand the Black Phantom as ransom. Vika and her fraternal twin are lured into a mine and stumble on a sinister and unearthly industry beneath the ground....