As most people who play the game know, the thief is the reporter for the newspaper Le Monde. As for what good that does you, here is the link to the site for Poptropica, which gives all kinds of helpful hints and clues.
The thief is the French reporter.
The lady from France. lol.
The 21st island on poptropica will be mystery train island.
Nope. It is a woman.https://poptropicatips.com/walkthroughs/mystery-train-island/
The thief is your mom. She is secretly playing Poptropica so you could stop playing the piece of sheet that it is.
depends which stage
Mystery train island
ask a differrent
HJ
In the janitors closet
use your brains stupid!
It was revealed in late July, 2011 that the 21st Poptropica island would be Mystery Train Island.