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On a cross-country vacation with their parents, twins Coke and Pepsi, soon to be thirteen, fend off strange assassins as they try to come to terms with their being part of a top-secret government organization known as The Genius Files.

After moving from London to an old mansion on the English coast, eleven-year-old twins Jason and Julia discover that their new home has twisting tunnels, strange artifacts from around the world, and a mysterious, locked door.

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.

Pip and her twin brother, Tim, awaken an alchemist's son from a centuries-long slumber when their family moves to an old English country estate, and he enlists them in the fight against an evil alchemist who seeks to create a homunculus.

"Following clues left by their missing father, twelve-year-old twins Bickford and Rebecca Kidd sail from the Caribbean to New York City with their siblings to finish the dangerous quest of their world-famous treasure-hunting parents"--Provided by publisher.

As the children of two world-famous explorers, eleven-year-old twins Celia and Oliver prefer television-watching to adventure-seeking until their father takes them to Tibet to help search for their long-lost mother.

Eleven-year-old Scottish Play Doe--his friends call him Scott--is convinced that the Goodco Cereal Company is secretly run by evil fairies who plan to turn kids into a zombie army by injecting "NEW! Intellijuice" in all their cereals.

All eleven-year-old twins Oliver and Celia Navel want to do is watch television, but their explorer father takes them in search of El Dorado, the Lost City of Gold, and their long-lost mother.

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.

Twins Ben and Zoe are recruited by their mysterious uncle Dr. Stephen Fisher, a famous zoologist, to rescue a Sumatran tiger from poachers.

"The wackiest road trip in history continues as the McDonald twins travel the Southwest dodging nefarious villains and visiting weird but true American landmarks"--Provided by publisher.

Twins Ben and Zoe are sent to Kenya to expose and stop the hunters who are killing elephants in the nature reserve for sport.

When a captive-bred dolphin is dumped in the Caribbean, the twins, Ben and Zoe, set out to locate and guide him to safety--but when a storm overturns their boat they find that the tables have turned.

The twins Ben and Zoe are sent to an Alaskan village in the far north to investigate the death of a mother polar bear and find and rescue her two orphaned cubs.