零点定理Ashionye, a reluctant Nigerian Shaman living in the south of England, who has been hired by an old family friend, Isioma Williams, to investigate and expel a malevolent spirit that has been tormenting her family after the death of her estranged husband, Magnus. To the chagrin of her demon hunting partner, Marv Taylor, Ashionye reluctantly accepts the job as a way to repay an old debt she owes Isioma. As Ashionye digs deeper into Isioma’s family situation, she finds herself standing against a familiar force that brought about her trauma since childhood.