Amy and her sister Daisy often don't see their dad for months at a time... so when it looks like he might be away for Christmas, they decide to pack their bags and join him on the other side of the world. Their dad is a wildlife cameraman making a film about a colony of penguins that surround a post office in Antarctica. When the sisters finally arrive after a tricky sea voyage, he enlists their help with filming the penguins! We follow the children as they learn to live in extreme cold, take a dip and even work in the most remote post office in the world.