A promise of adventure takes a deadly turn, as a walk in the woods leads fifteen-year-old Sam and her cousin Nell to witness a murder. Sam's haunting promise to a dying man takes them on a hunt to decipher clues which point to a treasure hidden somewhere in town. Soon, with the help of a new and handsome friend Dean, they are on a frantic chase against time. Using their combined knowledge and skills, Sam, Nell and Dean decode long-buried symbols. Their efforts unlock the secret to a historic discovery, and attract the attention of a killer determined to let nothing stand in his way of getting what he wants.

In this gripping tale, two teenage girls determined to solve cryptic clues left by a dying man embark on an amazing journey of discovery, and a race to evade a killer.