Baby-sitting blues . . . Since they were seven, Elizabeth and Jessica Wakefield have wanted a little sister.  Now that they're twelve, the twins know they're responsible enough to help out with a new baby, and they're determined to prove it to their parents. The twins get the chance when neighbors go on vacation and leave their five-year-old daughter with the Wakefields.  Chrissy's so cute and sweet, Jessica and Elizabeth think it's going to be easy to take care of her.  But from the moment Chrissy arrives, it's clear that she's spoiled.  Before long the twins begin to wish she would just disappear! When they get their wish and Chrissy does disappear, the twins are faced with their biggest problem yet.  They've got to find Chrissy before her parents come back! DON'T MISS ANY OF THE BOOKS IN THIS FABULOUS SERIES!