The Baby-sitters are split up for vacation, and Kristy's in the hospital. How will the girls stay in touch? Leave it to Kristy and her great ideas. She's received a special chain letter in the mail - one where you have to write a letter to someone else. So Kristy writes to Stacey, Stacey writes to Mallory, and pretty soon the chain letter is on its way through the club. But what are the letters about? You'll have to read them to find out. Inside this book is the entire collection of letters, cards, notes, and even presents that the Baby-sitters send to keep their chain letter going. So open the envelopes, unfold the letters, and read what the BSC members have to say. But shhhh! These letters are very secret.