Jonah fidgeted in his seat, and his chair fidgeted right along with him. In another mood, Jonah would have been fascinated by this—how was the chair programmed? Did it have a computer chip making it squirm? But right now Jonah was too distracted. He was sitting in a sterile, nearly empty room, waiting to travel back in time to an unknown era and unknown dangers. So all he could do was fidget.

You’d think, with time travel, there wouldn’t have to be any waiting, he thought grumpily.

Beside him, his eleven-year-old sister, Katherine, bounced in her chair—making the chair bounce too—and chattered away to Andrea, the third kid who would be going to the past with them. Indeed, Andrea was the most important time traveler that day. She was the reason they were all going.

“Don’t worry,” Katherine told Andrea. “You don’t have to hold your breath or anything to travel through time. It’s easy.”

“That’s good,” Andrea said softly. She sat perfectly still, and so did her chair. She had her eyes focused on the blank wall across from her and barely seemed to be paying attention to Katherine. Normally Jonah would have approved of that—he tried to ignore his younger sister as much as possible too. But unlike Katherine and Jonah, Andrea had never traveled to the past before. She didn’t know what time period she was going to, or what she’d have to do there. Shouldn’t she be asking questions? Shouldn’t she at least act like she cared?

“Only, if you get time sick, that’s no fun,” Katherine rambled on, flipping her blond ponytail over her shoulder. “When we went back to 1483 with Chip a