In a time when every continent that can be discovered has been discovered, Paul works as a cartographer who dreams of distant places. That is until he crosses Ana who folds maps for the same company. During a secret meeting he eventually discovers his own private America that cannot be found on any map of the world.

　　未经警告，成千上万的神秘外星人“门”突然出现在全球各地。为了急于确定它们到达的原因，人类必须共同努力了解这些宇宙异常的目的。在众生之门周围发生的奇异事件使人类质疑他们的存在和改变的现实，因为他们试图进入它们。