Symphony of the Underworld

Professor (or Detective) Francis Laurent and his assistant Phileria Elsion is invited to a concert by Phileria's old friend, Soledia Friagne, who will be performing in that concert with his 3 friends. But what greets them there is a murder case, where the victim is burned in a storage house behind the concert hall. The writing 'Phlegethon - River of Fire' was carved on the door of the storage house. With the victim being Friagne's friend, Phileria persuades Professor Laurent to solve this case and end the serial murder once and for all. Will Professor Laurent solve this case and put a stop on the serial murder? We will find out in this story.

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Okay this is my first mystery story and I'm new to this, so forgive me if things go wrong and stuff OTL. Anyhow, I hope you enjoy the story ^^