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Ten-year-old Moxy Maxwell has promised to write twelve thank-you notes by the day after Christmas so that she and her twin brother Mark can go to Hollywood to visit their father, but all her brilliant ideas to help finish the task more efficiently end up creating chaos in the house.

Twelve-year-old twins Philippa and John have more adventures when they become involved in an international adventure involving the Blue Djinn, the supreme arbiter of all djinn.

When twelve-year-old twins Philippa and John discover that they are descended from a long line of djinn, their mother sends them away to their Uncle Nimrod, who takes them to Cairo where he starts to teach them about their extraordinary powers.

Twelve-year-old djinn twins Philippa and John agree to help Dybbuk discover who murdered his best friend, and are soon caught up in an around-the-world adventure in search of the evil leader of the Cult of the Nine Cobras and his invaluable Cobra King talisman.

Andrew and Evie are determined to find their mother before the Company does.

While Connor faces trouble in the form of an obnoxious new crewmate, Grace, his twin sister, seeks out a vampirate guru who might be able to heal their dear friend Lorcan's blindness.

Eleven-year-old Miri Gill feels left out in her family, which has two sets of twins and her, until she travels back in time to 1935 and discovers Molly, her own lost twin, and brings her back to the present day.

Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

When three leprechaun statues disappear just before St. Patrick's Day, Bradley, Brian, Nate, Lucy, and other friends follow clues in order to prove that Lucky O'Leary is innocent of the crime.

Twelve-year-old New York City twins Meg and Edward have nothing in common, so they are just as shocked as everyone else when Meg's hopes for popularity and Edward's mischievous schemes coincidentally collide in a hilarious showdown.

When Zeke, his twin sister Stephanie, their neighbor Hector, and Hector's cat Fitz slide into the world of Underwhere, Zeke is hailed as a prince who will, according to an ancient prophecy, free the Undies from the evil UnderLord's rule by finding and destroying his throne.

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.

As a Father's Day gift to the twins' Dad, Bradley, Brian, and their cousins Lucy and Nate try to identify and stop whatever creature is biting fruits and vegetables in the garden.

Bradley and Brian need help from Nate and Lucy after a hypnotist turns their mother into a duck but does not quite get her changed back.

Twelve-year-old twins Felix and Maisie choose to stay with their mother when their parents get divorced and move into the attic of a historic mansion in Newport, Rhode Island, where they discover a hidden room filled with secrets.