Zoe Thicket is a spiritualist medium who communes with the dead. While searching for her missing twin sister Avery with the aid of a taciturn spirit guide, Zoe discovers the Ashen Tome. Gemina Umbra is a point-and-click interactive haunting about internal conflict and becoming your own worst enemy. Through the eyes of Zoe’s spirit guide, you, the player, influence Zoe in her endeavors to contact beings from the afterlife and determine her fate through the choices you make.