Susan, eighteen, left the midwest for L.A. and within two days found (a) lodging in the most charming house this side of Blandings' Dream with three fascinating roommates, and (b) talked her way into a job as a nurse's aid. The third day she fell for a young doctor, and then she found Jay, the brother of one of her roommates, hiding in the cellar--a runaway from trouble at school. He was practically her own age and she was strangely drawn to him too. The only unidentified factor here is the mystery in the title--unless it might be Jay's ""trouble."" Clearer is the attempt to underscore positive ideals and it's candycoated, like aspergum.