Two childhood friends are divided by the secrets at the heart of their nocturnal civilisation and beyond the dark sea that surrounds it. This tale of cultural discovery and coming-of-age in a nocturnal civilisation watched over by mysterious masked priests, set on a solitary island surrounded by a dark and endless sea... Sen and Anlil are childhood friends about to be parted as Sen starts down the path of priesthood, and Anlil creates a sacred offering that could save her household's reputation. As the unseen consequences of their choices unfold, Sen is drawn deeper, towards the intrigues at the heart of the priests' palace, whilst Anlil is pushed outwards, towards the boundaries of society. Both risk their souls, and perhaps even their lives, as they uncover the secrets beyond the dark shores of the island that feels like their whole world.