Song of the Forever Rains

In Song of the Forever Rains book, there is a hidden world of Aadilor, where magic and pleasure are everything. Where Thief King rules a trio of Mousai. The youngest Mousai Larkyra Bassette can slay monsters with his voice. The Duke of Lachlan stole a poisonous drug from the Thief Kingdom. Then Mousai Larkyra set on his first mission. to stop the corrupt duke.