This concluding book in bestselling author Tony Abbott's critically
acclaimed middle grade adventure series is a mile-a-minute thrill ride.
Perfect for fans of Rick Riordan and Ridley Pearson.
"Upon my life, I will." Across the centuries, every Guardian who has
protected one of the twelve relics of the Copernicus legacy has taken
this vow. But never have the consequences of the promise been more
profound. The secret network of the great astronomer's spies is the
target of an assassination plot, led by the despicable Galina Krause.
And now the Kaplans are more alone than ever before as they race from
France to Antarctica against a deadly ticking clock.
There is not much time left for Wade, Darrell, Lily, and Becca to find
the remaining relics and defeat their enemies. But are they willing to
risk the life of one of their own in order to save the world?