"With one disaster behind them, siblings Dan and Amy Cahill and their friends have just days to discover what the Outcast's next move will be. Their frantic search seems to be pointing toward a terrifying air disaster: the explosion of the Hindenburg airship. But no one travels by airship anymore--what do the Outcast's cryptic messages mean? The young Cahills must split up and take to the skies to try to find the answer before their whole world comes crashing down"--Page 4 of cover.
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