For years, Peter Wohlleben worked as a forester until he noticed that something is fundamentally wrong with our attitude towards trees. We merely see them as suppliers of things we need: oxygen, firewood or building materials. His book The Hidden Life of Trees appeared in more than 40 countries and was a real eye-opener for many people. The film combines Wohlleben's experiences from the forest with the latest scientific insights and gives us a whole new and exciting introduction to a world we thought we knew. With Wohlleben as a guide we travel to Sweden, where we find the oldest tree on earth, and to Canada where companies are looking for new ways to deal with deforestation. Simply replanting a chopped plot with new trees is not the solution to preserve the forest in all its richness and complexity. It is time - just like Peter Wohlleben - to listen to what the trees themselves have to say.