In an Universe as infinite in possibilities as it is in size, there is an alternative Earth where trees are mighty citadels towering for miles above the landscape. This world is Arbouron, where each tree is a sealed environment, these are the homes of the population of the planet. One apple tree lies on a weak point, where our reality and Arbouron almost touch. Events on one world have an effect on the other. In the Winter, when the Tree sheds its leaves, on Arbouron the population abandon the Canopy and its branches and spend the dark half of the year in the Roots. Only the Winter Squad, the dedicated team of maintanence engineers remain high above the ground, doing the repairs that are not possible during the Spring and Summer. Cadet Nevamar 331/29 is the newest member of the Winter Squad. Quick thinking during a crisis on the last day of Summer sees Nevamar promoted from the nameless ranks of the cloned Sprites. With three fellow Officer Cadets, Nevamar must become a part of the team and a rounded individual during a difficult and dangerous tour of duty in a world that is shuttered and silent. Growing up is hard enough, but Nevamar suffers from a rare condition that means that in a world where there are males and females, but the words "Man" and "Woman" do not exist, there is no way of knowing if life will be as masculine Anther called Nevamarant or feminine Style called Nevamarsya.