"Fans of the series will already be hooked, but even more skeptical readers may be a little curious what happens next. (Science fiction. 8-12)"
"Anyone who opens the book looking for science fiction will find the elements that make those stories work, but when readers finish this novel, they may think about picking up a history book. (Science fiction. 8-12)"
"The book is a perfectly competent adventure story. It's hard to go wrong with Vikings. But if you asked a classroom full of students to write about a Viking and a time machine, most of them would come up with something more inventive. (Science fiction. 8-12)"
"Off-the-shelf adventure modules, stocked with familiar character types and set into a scenario that is nonsensical even by the usual low standards of formula time-travel adventure. (Science fiction. 10-12)"
Kicking off a multiauthor, multimedia thriller series modeled on The 39 Clues, this paint-by-numbers opener endows three teenagers with a football-sized time device and sends them back to 1492 to keep Columbus from being killed in a mutiny.
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