Book excerpt: The hit series is back, to charm and inspire another generation of baby-sitters! When Dawn starts getting threatening notes and odd phone calls while she's baby-sitting, she doesn't know what to do. The notes are signed "Mr. X," and they're beginning to get scary. Normally, she'd tell the rest of the BSC, but this time things are different.The kids at Stoneybrook Elementary are having a Sitter of the Month Contest. The Sitter of the Month has to be someone who is in control--someone whose jobs always go smoothly. Dawn doesn't want to blow her chances at winning. But what if she's in real danger?The best friends you'll ever have are detectives, too!