Rosa, Arthur, Viola, and Luke are detectives. They’re no longer beginners— they’ve already solved one difficult case and earned the fame they deserved. But it seems that someone took their fame very badly. The moment they arrive at a summer camp, the kids receive a threatening note. And then trouble after trouble starts piling up, as if someone is trying to grind their reputation into the mud. What can be done about it? Stand up to it! They must find the troublemaker before the friends are kicked out of the camp. And so the friends take on a new investigation…