Young cabin steward, Sid, is proud to be working on the Titanic, the greatest ship ever built. Clara dreams of adventure too, but she's a stowaway in the hold of a much smaller boat, Carpathia. Here she meets the biggest, best dog she's ever known: Rigel, who is on his way to be reunited with his owner. None of them could have imagined how they would need each other one ice-cold terrible night - or that an extraordinary sea creature might also answer their call. . .