Kai's sister, Nya, is kidnapped and he must learn Spinjitzu from Sensei Wu, a mysterious old man, to rescue her.

From his 1776 Pennsylvania homestead, thirteen-year-old Samuel, who is a highly-skilled woodsman, sets out toward New York City to rescue his parents from the band of British soldiers and Indians who kidnapped them after slaughtering most of their community. Includes historical notes.

When his best friend disappears from her bedroom in the middle of the night, thirteen-year-old Theo uses his legal knowledge and investigative skills to chase down the truth and save April.

After three years in exile Kestra Dallisor has been summoned back to Antora by her father, right-hand man of the seemingly immortal king, Lord Endrick, but she is intercepted and kidnapped by the Coracks who want to use her to get the Olden Blade, which they believe can be used to kill the despot--Simon, one of the rebels with his own grudge against the Dallisors, is assigned to accompany her, but Kestra has her own plans and she does not intend to...

Aiden works with the FBI in order to rescue his sister Meg, who was kidnapped.

"As wild Chalklings threaten the American Isles and Rithmatists are humanity's only defense, Joel can only watch as Rithmatist students learn the magical art that he would do anything to practice." --

KC's mother and the clone of the President of the United States are kidnapped by disgruntled astronauts who want to take over the International Space Station.

Fifteen-year-old Daniel has followed in his parents' footsteps as the Alien Hunter, exterminating beings on The List of Alien Outlaws on Terra Firma, but when he faces his first of the top ten outlaws, the very existence of Earth and another planet are at stake.

"The Vespers have crossed a line. Amy and Dan were devastated when the Vespers kidnapped seven Cahills around the world, holding them hostage until Amy and Dan delivered an impossible ransom. But at least the hostages were Cahills - members of the world's most powerful family, trained to face all odds. Now the Vespers have gone too far. They've kidnapped Atticus, an innocent 11 year old boy and Dan's only friend. Now Dan and Amy are in the struggle...

When Echo's human friend, Rebecca Silver, is kidnapped by a witch who wants her for an assistant, Echo and the Bat Pack must risk their lives to rescue her.