Follow the delicious scent of cocoa all the way to Ecuador for a mouthwatering mystery inside a massive candy factory. The Thea Sisters are visiting a good friend who runs an amazing chocolate-making business. His factory is famous for its eco-friendly methods and is even in the running to win a major environmental award. But the sweet success suddenly turns bitter when the factory's production machines start breaking down in strange ways. The friends quickly realize this is no accident—someone is actively trying to sabotage the business and ruin their friend's chances of winning the prize. The five clever detectives must go undercover on the factory floor, inspect the sticky machines, and track down the culprit. They have to work together to stop the sabotage and save the chocolate supply before the factory is shut down.