A security alert during a school trip to a museum somehow sends Sam and Lisa back in time--and into the clutches of a ferocious eighth-century Viking crew. To help them return home, readers must solve an intriguing series of puzzles that will jump them to different pages in the book. This interactive, nonlinear mystery recalls the popular "Choose Your Own Adventure" stories, but with many more illustrations and activities. As children read the exciting story, they must complete mazes, word games, and other puzzles that will provide them with clues to which pages to turn to next. Solutions included.