Once Amy and Dan Cahill's choice was simple - take a million dollars or the first of 39 Clues that lead to the source of unimaginable power. Now it's clear that the hunt for Clues is bigger than anything that Amy and Dan could ever have imagined.
Fourteen-year-old Amy Cahill and her younger brother Dan, along with their babysitter Nellie, are continuing to search for the 39 clues to the secret serum that is rumored to cure all. Other clans of the family are searching, too. This is part of "The 39 Clues" series, readers will feel lost if they have not read the earlier books, although sufficient information is provided to enable one to mostly understand the storyline without prior knowledge. Similar to Lemony Snicket's "A Series of Unfortunate Events," the reader follows main characters, in this case a boy and a girl, through their searching for the final solution, amid others who are also seeking this same treasure and who will stop at nothing to win. This tenth volume ends the story, with the serum's recipe being discovered, and the families reconciling as one, just as the original hider of the clues had intended. Whether watching Shakespeare only to see ninjas overtake the stage or trying to scale a mountain on a deserted island that does not appear on any map, Amy and Dan triumph over all, learning history, literature, and more while they uncover the solution to each clue. Reviewer: Sara Rofofsky Marcus