I figured it's published by Scholastic, and from the Goosebumps writer R L Stine, it should be a soft horror, yes? No. High school student Heather is abused by her uncle. She, in fact, hates him. Along comes a charismatic teenage stranger, Snowman. Adult situations include a death, setting someone on fire, and stalking. Very scary, very unexpected.
Poor little rich girl . . . Coveting her money, Heather's uncle/guardian hates her and makes her life miserable. Heather sometines cannot help wishing her uncle dead. But when Heather's uncle really does die, her new boyfriend tells Heather that he killed her uncle . . .for her.