The Long-Lost Brother (Sweet Valley High)
Looks can be deceiving ...It's no secret that  pretty, popular Sara Eastborne has a twin brother named Tim. Sara had  told her friends at Sweet Valley High that Tim chose to live with their  father on the East Coast when their parents were divorced.  But she  didn't tell them that Tim was in reform school!Now Tim's out of  reform school and ready to start a new life in Sweet Valley with Sara  and their mother.  Sara desperately wants Tim to keep his criminal past  a secret.  When Tim becomes friends with Elizabeth Wakefield and starts  dating Sara's best friend, Amanda Hayes, Sara is afraid that the truth  will come out and her social life at Sweet Valley High will be  ruined.Tim has betrayed her before, and she isn't going to let  him do it again, no matter what.