Miss Decibel was one of the lieutenants of Le Paradox's gang and was sent to Ancient Arabia. Miss Decibel sought to obtain lost musical masterpieces of legendary musicians, such as Mozart and Beethoven.
Growing up as a child in a wealthy British family, Miss Decibel loved to perform classical music, but lacked the talent for it. Her recital attendents were unimpressed and very critical. One person even threw a rotten tomato at her, followed by boos. Miss Decibel then threw a huge tantrum, which caused her trumpet to fly up in the air and get stuck in her trunk. As Miss Decibel tried to remove the trumpet, she blew her trunk, which emitted a hypnotic note. Suddenly, the crowd was enjoying her performance. It was at that point, that Miss Decibel reaized she could contrl people with her hypnotic notes. She then turned to a life of crime, using her hypnotic notes to control and make people commit crimes for her. This is what caught the attention of Le Paradox and made him realize how valuable she would be to his team.
Miss Decibel had used her hypnotic skills to lure 3 members of Salim al-Kupar's gang and imprisoned them. She then hypnotized them into forging documents that would make Le Paradox the esteemed member of royalty in the future. After the Cooper Gang located and rescued them, they bugged Miss Decibel's office to figure out what the "secret door" in the lamp shop lead to. They discovered it lead to a secret underground docking station for Le Paradox's blimp. After Sly and the gang find this out in person, they are confronted by Miss Decibel and Le Paradox. Sly proceeds to defeat Miss Decibel in a fight, while Le Paradox escapes in a blimp, betraying Miss Decibel.