Intrepid kid detectives Marty, Remi, and Trina must answer find a bully lurking on the internet and stop him from targeting their classmates. In their toughest case, the fourth in the series, 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 Remi's trust. Not only does Marty have to find the cyber bully, but he also has to find a way to win back his best friend.