Vespera is the beguiling mistress of the Moonlit Cup, a lively tavern where travellers, rogues and respectable villagers become remarkably alike after midnight. With her striking indigo-blue hair, sharp wit and fearless charm, she commands every room without ever appearing to try.

Vespera hears far more than her patrons intend to reveal and keeps a ring of keys whose doors are known only to her. Though dismissed by some as a scandalous distraction, she is a shrewd judge of character and a discreet source of intelligence. Beneath the tavern lies a sealed chamber—and lately, something within it has begun answering whenever Vespera sings.