The Hulk, Sinatra, Pretty Boy - nicknames of three friends in the small Florida town of Cobra Lake. "Sinatra" is Olivia Kelly, cute, smart, talented and driven; "Pretty Boy" is Devin Yau, funny, athletic and addicted to CSI TV shows; "The Hulk" is Cassie Saunders and Cassie has a secret, and she promised herself she'd always keep it to herself. The eleven year old African-American elementary student has a mark on her wrist, it looks like a tattoo and she hides it by covering it with her watch, a watch that doesn't even work anymore. Cassie is the daughter of a very important man in town, but she wasn't born with the mark that looks like a cobra, it mysteriously appeared one day...the day her grandmother died. Bessie Saunders was a very well loved and known person in this small town, her death touched everybody. The three friends are on a mission to find out how she died and the only clue is the mark on Cassie's wrist.