Stolen

Laura thought her life was bad enough. But when she comes home to a house without a sister her world is turned upside down.
Laura at age 13 in only seventh grade has a brother, Toby, who is 6 and a twin sister, Clara. When Laura comes home after a stressful sleepover with her best friend, Kelly, she is ready to spill her guts out to her sister. But instead she comes home only to see her parents at the kitchen table, her mother crying and her father printing out missing posters with Clara's face on them. She's then ready to find Clara no matter what.