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Wildlife cameraman Gordon Buchanan travel to far flung Svalbard to find a polar bear birth den and meet mother Lyra and her cubs Miki and Luca as they emerge from their den.

Gordon Buchanan and the team return to Svalbard in mid-June to try to understand how his polar bear family are surviving the unusual arctic weather. He discovers that cub Luca is missing.

Gordon and the team return to Svalbard in September. They don't know if either bear is still alive. Lyra's collar hasn't sent a signal for a month - finding her this time will be a huge challenge.