When Elizabeth Wakefield learns that Regina Morrow has returned unexpectedly to Sweet Valley from Switzerland, she drops by to visit. A strange woman answers the door and says Regina cannot have visitors. With the help of Jessica, her twin, and Bruce Patman, Regina's boyfriend, Elizabeth discovers that Regina and her parents are being held hostage!
If Elizabeth calls the police, the Morrows may be killed. So she, Bruce, Jessica, and Regina's brother, Nicholas, vow to rescue the Morrows on their own-before the kidnappers take desperate action.