Margo is making herself right at home in Sweet Valley, setting her evil scheme in motion. She's gotten a job at the day-care center, and is busy perfecting her imitation of identical twins Jessica and Elizabeth Wakefield. She's even fooled Todd Wilkins and Mrs. Wakefield into thinking she's Elizabeth. Now it's only a matter of time before Margo takes over Elizabeth's perfect life for good.
Meanwhile, Winston Egbert was baby-sitting for a neighbor. Now the neighbor has dissapeared. What's Winston going to do with a baby?

Suddenly, Elizabeth saw herself standing on the shore of Secca Lake in the brittle sunshine. A girl glided toward her in slow motion - a girl who might have been Jessica, except for the cold look in her bright eyes. The girl pulled off her hat, and shoulder-length dark hairtumbled out. She whipped out a butcher knife, and . . .
Elizabeth shook her head to clear it of the memory. It was the recurring nightmare she'd had for weeks after the accident.

Will Margos succeed? The Evil Twin