Astrid and Raphaëlle's third season premiere, "Piano-forte," centers on a complex investigation into the murder of a renowned pianist, where evidence points to a high-tech "ghost" piano, as seen in the episode. The episode, which explores the competitive world of classical music, focuses on the growing friendship between Astrid and Raphaëlle while dealing with the investigation. The "ITA DLMux" indicates an Italian dual-language version containing both the original French audio and an Italian dub.