Paris, 1897. The musician drowned in shallow water during a wedding celebration. His colleague, returning from a concert, fell and broke his head. The prima ballerina fainted on stage during the premiere. The chain of strange and tragic events did not end there, the mysterious avenger has already chosen a new victim and has prepared a gift for her... A new investigation involves booksellers, and part-time amateur detectives Victor Legris and Joseph Pignot, in a mesmerizing dance of death around the Garnier Palace, where the famous opera house is located theater.