Gordon Buchanan and the team return to Svalbard in mid-June on the trail of Lyra and her cubs Miki and Luca. Gordon works with scientists to try to understand how his polar bear family are surviving the unusual arctic weather. He finds Lyra and renews his bond with her, but discovers that cub Luca is missing. Lyra is devoted to her remaining cub Miki, but his future is also uncertain. Gordon documents the intimate details of polar bear family life as he sees Lyra and Miki in their epic struggle to survive as this mother bear tries to keep her cub safe.