Simon Donald narrates a documentary about the Cairngorms in the Scottish Highlands. A mountainous park where wolves, buffalo and beavers still roam, reminders of Scotland's Ice Age past, it is one of the wildest places in the UK, especially during winter. The people that live here work alongside some of Britain's rarest and most unusual wildlife, including capercaille and wildcats. However, there is a feeling that winters in the Cairngorms are changing.