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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.

Eleven-year-old twins Jason and Julia, along with their friend Rick, find themselves in ancient Egypt in search of an important map after going through a magical door in their old English mansion.

Eleven-year-old twins Jason and Julia, along with their friend Rick, match wits with Peter Dedalus, the elusive inventor who created Kilmore Cove's Mirror House, as they try to uncover the secret hidden somewhere inside before Oblivia Newton can find it.

The fifteen-year-old Murry twins, Sandy and Dennys, are accidentally sent back to a strange Biblical time period, in which mythical beasts roam the desert and a man named Noah is building a boat in preparation for a great flood.

Twins Truman and Camille, spending winter break with their paternal grandmother, follow a secret passageway to the Breath World, where all creatures of magic dwell, to find the Ever Breath, a magical stone that maintains balance between worlds.

Rowan, Nina, Xanthe, and Xavier are reunited in a time travel mission to ancient Egypt in the time of Cleopatra, but a jealous Xanthe makes decisions that put them all in jeopardy.

Sixteen-year-old twins Harry and Barry stumble across a gateway to another universe, where a distortion in time and space causes a dramatic change in their competitive relationship.

Feeling inferior to her talented twin brother, teenaged Isabel is transported to a parallel world that resembles the Italian Renaissance city-state of Ravenna, where she tries to save the city from attack by the fierce Gate people.

Rowan, Nina, Xanthe, and Xavier are reunited for their first solo time travel trip, venturing to Bloomington, Illinois, in 1856 in search of an unhappy teen whose decision to run away from his father seems to have changed history.

Seventeen-year-old Miguel Schreiber and a long-term enemy are drawn into a strange dream world when they fall in love with shapeshifting sisters from Australia--twins hiding from a cursed ancestor who can only be freed with the girls' cooperation.

When Josh Cope is recruited by an international corporation, he finds himself pulled into a nightmare as he is caught in a place between dreams and reality, filled with danger and the threat of destroying the past.

An old coin in The Treasure Chest transports twins Felix and Maisie to the island of St.

After having an argument in the treasure chest room, twins Felix and Maisie are transported to China during the Boxer Rebellion, where they meet a young Pearl Buck who teaches them how to survive as Americans in China.

When twins Abby and Derick start junior high at the prestigious academy their grandfather founded, Cragbridge Hall, they discover firsthand the dangers of time travel and must find a way to save their parents, who have been sent to the Titanic the night it sank.

Jonah was able to save all of time from collapsing but in doing so gained a twin brother, Jordan, who must learn what has happened and do his own part to save time--and his parents.