Cathy's Key: If Found, Call 650-266-8202 — Sean Stewart

Cathy was your average high school student -- doodling in the margins of her journal, crushing on a cute boy, and hanging out with her best friend Emma. As this story begins, she's trying to keep a job, her journal is stolen, the cute boy is not who he seems to be, and even Emma's side project/start-up company, Doubletalk Wireless, is about to get caught up in the mystery surrounding Cathy and her search for the truth about her father. Her presumed-dead father.

It's just a simple story, really: Girl loves Boy, Boy disappears, Girl discovers secret that will alter the course of humanity...