In 1891, in a world transformed by 1799's Great Disruption--when all of the continents were flung into different time periods--thirteen-year-old Sophia Tims and her friend Theo go in search of Sophia's uncle, Shadrack Elli, Boston's foremost cartologer, who has been kidnapped.

Dan is not sure he'll survive the boring field trip to a remote heritage farm.

How could a place with no running water, telephone or electricity be anything but dull? The farmer knows nothing about farming and seems angry about having to conduct the tour. And what's with his tattoo? The teacher requests a private word with the farmer and then mysteriously disappears. Dan decides to investigate and uncovers a deadly plan.

...

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.

A new era dawns in the forest... After moons of deliberation and strife, the forest cats have settled into five camps, following the spirit cats' advice to spread out like the petals of the Blazing Star. But now the dangerous rogue Slash has kidnapped Star Flower and made demands for prey that the forest cats cannot afford to meet. Clear Sky is desperate to save his mate and the kits she carries, but he cannot do it alone. To have any hope of defeating...

Jacky Faber and her classmates at the Lawson Peabody School for Young Girls in Boston are kidnapped while on a school outing and transported in the hold of a slave ship bound for the slave markets of North Africa.

Beka, having just lost her fiance in a slaver's raid, is able to distract herself by going with her team on an important hunt at the queen's request, unaware that the throne of Tortall depends on their success.

Kidnapped by Celtic Druids in 433, Patrick and Beth are headed to certain death when followers of a former Irish Slave (Saint Patrick called Patritius in this book) save them. The cousins find themselves in the midst of a power struggle between Irelands King Logaire, Patritius, and the leader of the Druids, Lochru.

Prince Liam. Prince Frederick. Prince Duncan. Prince Gustav. You've never heard of them, but you've probably heard of Prince Charming, the guy who rides in at the last minute to save the girl. Well that's them, all four of them. They are all Prince Charmings. Only in reality, they are a little less heroic than you might expect. When Prince Liam is kidnapped and forced to marry the evil Briar Rose, they must unite again to save him. But can they really...

"Discovering that the creatures and deities of Tagalog myth are real when her mom is kidnapped, Lulu Sinagtala is drawn into a centuries-long war that threatens to throw the whole universe into chaos while trying to save her mom with her newfound powers"--

As Bluejay--Mo's fictitious double--tries to keep the Book of Immortality from unraveling, Adderhead kidnaps all the children in the kingdom, asking for Bluejay's surrender or the children will be doomed to slavery in the silver mines.