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The Virals are put to the ultimate test when they find a geocache containing an ornate puzzle box. Shelton decodes the cipher inside, only to find more tantalizing clues left by 'The Gamemaster.' A second, greater geocache is within reach - if the Virals are up to the challenge. But the hunt takes a dark turn when Tory locates the other box - a fake bomb, along with a sinister proposal from The Gamemaster. Now, the real game has begun: another bomb is out there - a real one - and the clock is ticking.