They've been to three worlds in less than a day. Time isn't just running out...it's running wild.

David King is reeling from his travels through history-and the evil he's found there. The last thing he needs is his great-great-uncle Jesse's hospital-bed instructions: You can't simply do nothing. You must fix things.

David and his brother Xander's search for their abducted mother has repeatedly led them on strange and terrifying journeys as they've stepped through the portals of the creepy old house and into some of history's most turbulant moments...and confronted an...

Which door would you go through to save the world?

David, Xander, and Toria King never know what new adventures--and dangers--await them beyond the mysterious portals hidden on the top floor of their new house. They have battled gladiators and the German army, dodged soldiers on both sides of the Civil War, and barely escaped a fierce attack in their own home.

Still they are no closer to finding their mother, who was pulled by powerful forces through a portal and lost in time.

Their only hope is to turn the tables on Taksidian, the menacing stranger who wants...

Their destiny is to fix history. Their dream is to get home.

When you live in a house that's really a gateway between past and present, you have to be ready for anything. It's a painful fact the Kings have faced since moving to Pinedale eight days ago. Desperately trying to rescue their mother from an unknown time and place, brothers Xander and David have lunged headlong into the chaos of history's greatest--and most volatile--events. But their goal has continually escaped their grasp.

And worse: Finding Mom is only a small part of what they must do, thanks to...