She is arrested, and off in prison somewhere.
The Black Widow is never in the museum (at least not as the Black Widow).
skrow you
His location, like that of the Black Widow, is unknown. Presumably he still went to prison. The Black Widow was apparently given time off her sentence to appear on Reality TV Island.
The Black Widow (veuve noire) is posing as the police inspector, whose house is in the Country Side. It is on the far right of Counterfeit Island.
you can't
in the inspectors cottage
beat the black widow
the black widow
in the lair of black widow
you go to the art musem
You don't have to find the Black Widow. She will find you. (Check the colorful painting.)
After you have beaten the Black Widow and recovered the stolen art, talk to the Curator at the exit from the Lair, then meet her at the Museum to receive the Island Medallion. (for the island solution, see the related question)