艾德娜（罗苹·纳文 Robyn Nevin 饰）虽然年事已高但一直过着独居生活。一天，她的女儿凯（艾米莉·莫迪默 Emily Mortimer 饰）和孙女山姆（贝拉·希思科特 Bella Heathcote 饰）接到了警方的来电，告知了她们艾德娜失踪的消息。震惊之余，两人急急忙忙的赶回了祖宅。 　　搜索行动刚刚展开没多久，艾德娜竟然自己又出现了。对于失踪的这几天的经历，艾德娜只口不提，大家也只能够以她换上了阿兹海默症来解释这一切。艾德娜的回归让大家都松了一口气，但谁知道悲剧才刚刚开始，回家后的艾德娜一改往日的心性，就仿佛变了一个人一样，有时候她的举动甚至让凯和山姆感到恐惧。When elderly mother Edna inexplicably vanishes, her daughter Kay and granddaughter Sam rush to their family's decaying country home, finding clues of her increasing dementia scattered around the house in her absence. After Edna returns just as mysteriously as she disappeared, Kay's concern that her mother seems unwilling or unable to say where she's been clashes with Sam's unabashed enthusiasm to have her grandma back. As Edna's behavior turns increasingly volatile, both begin to sense that an insidious presence in the house might be taking control of her. With RELIC, first-time writer/director Natalie Erika James crafts an unforgettable new spin on the haunted-house movie.