The adorable residents of Hotel Strange are busy planning a music festival, until thieves kidnap Marietta and Mr. Léclair. A cast of quirky characters sets out to rescue them. As usual in Hotel Strange, distractions abound. They must first solve the mystery of a missing sapphire to save their friends, and the festival!

Florian Ferrier is a French producer of animated television programs. He co-wrote the graphic novel series Hôtel Étrange (Hotel Strange) with his wife, Katherine Ferrier.