该剧改编自Janice Hadlow的同名小说，以低调、常被忽略的玛丽·贝内特为主角：“玛丽不是你常见到的那种年代剧女主，跟姐妹们不一样，她奇怪、焦虑、爱说教、实际……她被母亲所忽视，看起来她的舞会卡注定会一辈子空落落……直到玛丽决定：一切由自己来做主。”在这个故事中，玛丽经历了属于自己的一段史诗爱情，她从Meryton那安逸和给人幽闭恐惧的家中，去到了浮华的摄政时期伦敦，以及田园牧歌的湖区，寻找独立、爱情和接受。

　　As devout Jehovah's Witnesses, sisters Alex and Luisa and their mother, Ivanna, 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 provides rare insight into the complex nature of faith, family, duty and love.