Fluke, a southern right whale calf, is born under the shadow of the great harbour bridge. People flock to watch Fluke and his mother playing together in the sheltered waters of the harbour. Fluke is safe and happy in the warm harbour water… until one day he becomes separated from his mother.
Fluke takes fright, panics and flees to the bottom of the ocean. Eventually he is found, nuzzled up against a moored yacht, and is reunited with his mother. The two of them stay in Sydney Harbour until just before summer when it is time for them to set off on their long journey south.