Shadow of Doubt — Norah McClintock

I looked at Ms. Denholm. Her face had turned milk-white. Is there a note in there? she said. I looked into the box again. It contained a dozen red roses. Nestled among them was a baby doll, splattered with what looked like blood but was probably red paint. Its head was missing.

Robyn's new substitute teacher Ms. Denholm is cool, pretty, and possibly the target of a stalker. When Denholm receives a threatening package, Robyn wonders who's responsible. But Robyn has a mystery of her own to worry about. What's with the muddled phone message she receives from her missing ex-boyfriend Nick? Should she try to forget him--or is the call a sign he still cares?