When "The Three Investigators" Justus Jonas, Peter Shaw and Bob Andrews are forced to make an emergency landing on a rocky plateau during a hot air balloon tour, they have no idea that a new mystery awaits them in this wasteland. They end up in a mysterious institute where the musicians of an orchestra can create the illusion of colours, smells and tastes in the listeners with sounds. The fact that this miraculous world has its dark side becomes apparent at the latest when the three detectives meet Chloe, who has secretly sneaked into the institute to look for her missing sister. Chloe suspects that the mysterious orchestra leader Yamada is holding her sister Fran against her will and wants to use her for dark machinations. Together with Chloe, "The Three Investigators" set out to find Fran and discover the dark secret behind Yamada's vow of revenge: his symphony Phonophobia becomes one of the greatest dangers "The Three Investigators" have ever had to face...