Despite problems at home, sixteen-year-old conjoined twins Tippi and Grace are loving going to school for the first time and making real friends when they learn that a cardiac problem will force them to have separation surgery, which they have never before considered.

Having felt deprived all her life of schooling, friends, mother, and even her name by her twin sister, Louise finally begins to find her identity.

After thirteen-year-old Conner returns to the Land of Stories and reunites with his twin sister, Alex, who is training to become the next Fairy Godmother, war breaks out in the fairy-tale world.

While armies of the Shadowrealms gather and Machiavelli goes to Alcatraz to kill Perenelle Flamel, fifteen-year-old twins Sophie and Josh Newman accompany the Alchemyst to England to seek Gilgamesh.

Through the mysterious powers of a cherished book of stories, twins Alex and Connor leave their world behind and find themselves in a foreign land full of wonder and magic where they come face-to-face with the fairy tale characters they grew up reading about. But after a series of encounters with witches, wolves, goblins, and trolls alike, getting back home is going to be harder than they thought.

Back in London, fifteen-year-old twins Sophie and Josh Newman must determine whom they can and cannot trust as they search for both Scatty and an immortal who can teach Josh the magic of fire, while Doctor Dee and Machiavelli continue to seek power.

When Emma Paxton steps into the life of her long-lost twin Sutton to solve her murder, she finds new suspects at every turn, while Sutton looks on from her afterlife.

In order to end the Masked Man's literary army, the twins and their friends must enter Conner's short stories, where they find allies in unexpected places.

When twins Connor and Grace's ship is wrecked in a storm and Connor is rescued by pirates, he believes that Grace has been taken aboard the mythical Vampirate's ship, and he is determined to find her.

In a future world where teenagers are taken, imprisoned, and forced to fight for their survival, well-behaved Cassie will do whatever it takes to save her rebellious twin sister Becca from Death Row.