Who is the black widow on counterfeit island?

Answer 1

The Black Widow is a notorious art thief out to steal valuables from the Museum Fantastique. By the end, you realize that she has been posing as the female Police Inspector (same black hair and red lipstick).

(*Look closely when you are arrested : that's her henchman, the shady guy, dressed as a policeman when they "catch" you at night at the museum.)