Adam Grey, a young anthropology graduate student, becomes an unlikely and reluctant hero as he finds himself mentally linked to an arrogant and irreverent ethereal being and tasked with taking on the role of 'gatekeeper' on the Dead Highway – the 'in-between' zone separating the world of the living from the realm of the dead. Adam's only source of guidance as he searches for the missing soul of his deceased fiancé comes in the form of Elijah, a powerful astral being (masquerading as a human homeless man) who has a strained relationship with 'the entity' with whom Adam now finds himself bonded. Discovering that the majority of human souls fall victim to the ravenous 'Seekers' – leather-clad, motorcycle-riding demons – and never successfully pass through to the afterlife, Adam is shocked to uncover an ongoing war between two very different species of incorporeal beings, with the life force/'soul' material contained within our human bodies as the ultimate prize. Realizing that the fate of humanity itself is at risk as this spiritual war spills into the living world for the first time, Adam slowly comes to terms with his responsibility and must eventually face the fact that the only way to truly save the souls of the human race is to sacrifice his own humanity.
