Twins Josh and Emma Binkerton swore they'd never return to the Good Times Travel Agency. Only now, a terrible storm has driven them and their little sister, Libby, right through its doors. Worse, Libby's opened another of Julian T. Pettigrew's guidebooks, and the Binkertons find themselves hurtling back in time -- to the Viking Age. All seems fine, at first, as the children are welcomed by the locals. But they quickly realize that Viking life is not for the faint of heart: it involves beds made of earth, monotonous farm work and death-defying sports. And when Josh and Libby inadvertently stow away on a Viking ship headed for a raid, it suddenly turns perilous! Can the Binkertons finish the guidebook and travel back to the present before it's too late?