Karen's Chain Letter is the 101st book in the Baby-Sitters Little Sister series.
Back Cover SummaryEdit
Karen has started collecting stamps. She wants some special new ones, but the mail just brings the same old kind.
Then Karen gets a chain letter. It promises good luck and piles of postcards — if Karen answers quickly. Piles of postcards means piles of stamps, right? And good luck — what could be wrong with that? Karen wants to link up with this chain letter right away!