Cathy's Book

Cathy's Book: If Found Call (650) 266-8233 is a young adult novel with alternative reality game elements by Sean Stewart and Jordan Weisman, illustrated by Cathy Brigg. It was first published September 12, 2006 by Running Press. It includes an evidence packet filled with letters, phone numbers, pictures, and birth certificates, as well as doodles and notes written by Cathy in the page margins.
Synopsis
The book follows a teenage girl whose boyfriend has left her. Wanting to find out why, she follows clues with her best friend. These lead to various explanations.
In a framing device, young and artistic Cathy left the book for Emma, her best friend, so that the latter can use the clues provided and figure out where Cathy went. The story begins when Cathy is dumped by her boyfriend, Victor. The next morning she notices a strange mark on her arm, but sets it aside as a spider bite. She and Emma later determine that the mark on her arm is in fact...