"When the world sees Frey, they think they see her twin sister Rafi. Frey was raised to be Rafi's double, and now she's taken on the role . . . without anyone else knowing. Her goal? To destroy the forces that created her. But with the world watching and a rebellion rising, Frey is forced into a detour. Suddenly she is stranded on her own in Paz, a city where many of the citizens attempt to regulate their emotions through an interface on their arms....

The struggle for control between the Armstrong twins and the group known as BZRK continues with the stakes higher than ever.

The magical world of Artimé is gone and the Unwanteds are looking to Alex Stowe for answers, but while his twin brother Aaron continues to build his army in Quill, a very dangerous common enemy is revealed.

"West Grayer lives in a world where every person has a twin, or Alt. Only one can survive to adulthood, and West has just received her notice to kill her Alt"--Provided by publisher.

"The Masked Man possesses a powerful magic potion that turns every book it touches into a portal, and he is recruiting an army of literature's greatest villains! So begins a race through the magical Land of Oz, the fantastical world of Neverland, the madness of Wonderland, and beyond. Can twins Alex and Conner catch up to the Masked Man?" --

The twins investigate a spooky old house to find a long-lost treasure for an old woman.

Eleven-year-old twins Miles and Beckett Fowl enjoy adventure and mayhem while helping a troll escape nefarious forces that want his magic.-- One week after their eleventh birthday, the Fowl twins-- scientist Myles, and Beckett, the force of nature-- befriend a troll who has clawed his way through the earth's crust to the surface. Unfortunately the troll is being chased by a nefarious nobleman and an interrogating nun, who both need the magical creature...

Moffie is ten minutes older than her twin brother, Morgie, and so she is always in charge, but when their mother says she is too bossy, Moffie decides to make Morgie boss for a day.

When a set of priceless paintings by Leonardo da Vinci and Rembrandt go missing in Russia, the Kidd siblings head to St. Petersburg and the wild Arctic tundra to find the bad guys and locate the treasure.

Bradley, Brian, Nate, and Lucy try to help out the Flying Fortunatos, an acrobatic troupe with a very shabby traveling circus, by identifying the marvelous, hooded trapeze artist they spied rehearsing.