一晚，儿子离奇失踪，妈妈遍寻不著连忙报警，儿子却突然现身「我哪都没去啊!」；那天起，妈妈需要靠著药物治疗病症，却发现熟悉的儿子渐渐陌生，彷若被鬼魅控制取代…Trying to escape her broken past, Sarah O'Neill is building a new life on the fringes of a backwood rural town with her young son Chris. A terrifying encounter with a mysterious neighbour shatters her fragile security, throwing Sarah into a spiralling nightmare of paranoia and mistrust, as she tries to uncover if the disturbing changes in her little boy are connected to an ominous sinkhole buried deep in the forest that borders their home.