SHAZAM!
With the help of the ACME Detective Agency, I managed to find exactly where in the world your oldest sister, Carmen Sandiego, is. It involved talking to a lot of locals and getting geography clues that I had to look up in my pocket encyclopedia, but I must say I learned a lot.
I hate to be the bearer of bad news, but your sister's been doing some really bad stuff. Been stealing historical buildings and artifacts and the like.
WAIT A MINUTE! How the heck do you steal a building?
I wish I had a donut.