How do you find a bully who lurks on the Internet and lashes out at helpless victims? Intrepid kid detectives Marty, Remi, and Trina must answer that question if they're to stop a cyber bully targeting their classmates.

In their toughest case yet, the sleuths must follow the electronic trail to their enemy, but the cyber bully outsmarts them at every turn, leaving the trio to wonder if they've met their match. When a ploy to expose the culprit goes wrong, Marty does the unthinkable and loses his best friend Remi's trust. Not only does Marty have to find the cyber bully, but he also has to find a way to win back Remi's friendship.

Marty Chan is back with the exciting fourth installment in the Marty Chan Mystery series.