twins

After their mother dies in a plane crash, ten-year-old Christina and her twin brother move with their father to a seemingly haunted house in a strange neighborhood.

When Elissa's nightmarish visions and inexplicable bruises lead to the discovery of a battered twin sister on the run from government agents, Elissa enlists the help of an arrogant new graduate from the space academy.

Tandy Angel is, along with her brothers, a suspect in their parents' murder but having grown up under Malcolm and Maud Angel's perfectionist demands, Tandy decides she must clear the family name no matter what.

Tom and Eddie, identical twins and mirror opposites living on two different Earths some fifty years apart, must switch places and identities to thwart the alien scientists who threaten their planets.

Told in their separate voices, twelve-year-old twins Percy and Penny are excited to spend a summer riding horses on their Uncle Stretch's Minnesota spread, until they discover it is a pig farm.

Tony DiMarco, who had just turned thirteen, catches a murderer, solves a mystery, and discovers a treasure during the first few days in his new home at 13 Hangmen's Court in Boston. In the attic bedroom of the house, Tony comes together with four other thirteen-year-old boys from different times in history, and they are all connected to a murder, a mystery, and a treasure.

Feeling betrayed, fifteen-year-old Enid follows her boyfriend, Wick, from Vermont to Maryland where he and six others they know from twin studies rent a yacht, but after she sneaks aboard a storm sets them adrift without food or water, fighting for survival.

Twins Jaide and Jack Shield discover that their father and grandmother are "wardens," tasked with defending portals and humanity from evil, but their lives change forever when they learn that they share the same powers.

Anna's new friend, Emma, looks just like her, but Emma is a bit of a trouble maker.

While staying on a ranch in Montana with family friends, Marisol begins to fear that she might be living with a werewolf.