On the Run — Francine Pascal

A shadowy past . . .

After a chilling encounter with murder, Jessica and Elizabeth Wakefield are now ready for a calm summer in Sweet Valley--until Eric Hankman appears.

Like Elizabeth, Eric is a quiet, sensitive writer, and the two of them immediately become friends.

But Jessica's not convinced that Eric is as perfect as he seems. Her suspicions are aroused when her new friend, Darcy Kaymen, thinks she recognizes Eric as a boy from her hometown who has a mysterious past. Jessica knows Elizabeth won't believe a word of Darcy's story without evidence, but by the time she has all the proof she needs, it may be too late to save her sister.