As devout Jehovah's Witnesses, sisters Alex (Molly Wright) and Luisa (Sacha Parkinson) and their mother, Ivanna (Siobhan Finneran), are united in The Truth. Alex looks up to her confident older sister, while striving to follow in Ivanna's footsteps as a ‘good Witness'. But when Luisa starts to question the advice of the Elders, she makes a life-altering transgression that threatens to expel her from the congregation. Unless Ivanna and Alex can persuade her to return, they must shun her completely. This challenge becomes more painful when their family is faced with another heartbreaking test of faith.

Written and directed by Daniel Kokotajlo, a former Jehovah's Witness, Apostasy is a remarkable and authentic debut film, providing rare insight into the complex nature of faith, family, duty and love.