What is a tree? Why are they so important to life on Earth? How do they eat, breathe, grow, communicate, and regenerate themselves? How many different kinds of tree are there and where do they live? In this beautiful little book, illustrated with rare old engravings and specially commissioned drawings, internationally renowned Finnish tree boffin Professor Olavi Huikari takes us on an unforgettable journey deep into the secrets of these hugest and most majestic of life forms.