Thirteen-year-old Jonah has always known that he was adopted, and he's never thought it was any big deal. Then he and a new friend, Chip, who's also adoped, begin receiving mysterious letters. The first one says, "You are one of the missing."

The second one says, "Beware! They're coming back to get you." Jonah, Chip, and Jonah's sister, Katherine, are plunged into a mystery that involves the FBI, a vast smuggling operation, an airplane that appeared out of nowhere -- and people who seem to appear and disappear at will.

The kids discover they are caught in a battle between two opposing forces that want very different things for Jonah and Chip's lives. Do Jonah and Chip have any choice in the matter? And what should they choose when both alternatives are horrifying?

Jonah and Chip have barely adjusted to the discovery that they are actually the missing children of history when a time purist named JB sends them, along with Katherine and Alex, hurtling back in time to 1483.

JB promises that if they can fix history, they can all return to their present-day lives. Now Chip and Alex have to reclaim their true identities—as the king and prince of England. But things get complicated when the four discover that according to the records, the princes were murdered. How can they fix history if it means that Chip and Alex will die?

After helping Chip and Alex survive 15th-century London, Jonah and Katherine are summoned to help another missing child, Andrea, face her fate. Andrea is really Virginia Dare, from the Lost Colony of Roanoke.

Jonah and Katherine are confident in their ability to help Andrea fix history, but when their journey goes dangerously awry, they realize that they may be in over their heads: They’ve landed in the wrong time period. Andrea doesn’t seem that interested in leaving the past. And even worse, it appears that someone has deliberately sabotaged their mission.

Jonah was able to save all of time from collapsing but in doing so gained a twin brother, Jordan, who must learn what has happened and do his own part to save time and his parents.