'One hero lost in a raging tsunami.
'One Sign pointing to a deadly battle.
'One day left until the end of . . . everything.
'With Sydney plunged into underwater chaos, the DARE winners are suspected of being responsible. After escaping from security officers, they must race to their final destination-- Felix Scott's mega-ship Infinite Horizon --and decode one last deadly sign. If they don't get this right, then it's game over-- not just for them, but for the whole world. The DARE winners will have to use all their wits to stop The Signmaker. But after a mind-blowing secret is revealed in Antarctica, they're in for a heart-stopping final face-to-face battle with an unimaginable enemy. Who will live and who will die? If you could be a hero, would you DARE? Seven Signs. One day left to save the world.' (Publication summary)