Professor Heine sends the princes on an assignment to investigate rumors of a criminal in the palace, and the truth shocks them.
Gregor's favorite store. His neighborhood.
.قصدنا متجر غريغور المفضّل وجيرانه
Gregors Lieblingsladen.
Seine Nachbarn.
El local favorito de Gregor…
Su vecindario…
El local favorito de Gregor…
Su vecindario…
I locali preferiti di Gregor,
A loja favorita de 
Grego, a sua vizinhança.
Любимый магазин Грегора. Его район.