Samuel and Morgan are twin brothers separated by several oceans. Once, when they were children together, they shared not only a family and a childhood, but a secret imaginary world that had a language of its own: Nahum. But that was decades ago, before Morgan became a wanderer whose only contact with his brother was stories, written in Nahum. When Morgan unexpectedly passes away in the Netherlands, the woman he was living with -- the mysterious Ana -- agrees to accompany his body, and his final Nahum story, home to Australia. What she carries home to Samuel is not just a manuscript, but a startling revelation.