Karen's Big City Mystery is the 99th book in the Baby-Sitters Little Sister series.
Back Cover SummaryEdit
Karen is visiting her little-house family in Chicago for a whole month! She wonders what she will do there.
Then there is a robbery in the building. Now Karen has a mystery to solve! She makes a list of suspects. She looks for clues. And soon she thinks she knows who the burglar is.
Can Karen crack the case?