In Nightmare's End, paranormal investigators Ava and Austin are confronted with their most chilling case yet. Ava's recurring nightmares over a past tragedy lead them to a house where an unspeakable horror once took place. Their worst fears are realized when it becomes clear that the demonic entity responsible for the previous tragedy has returned, possessing an unsuspecting family member. Determined to banish the demon once and for all, Ava and Austin must devise a plan to send it back to the depths of hell. But the cunning demon forces a wedge between the inseparable pair, threatening to dismantle their bond and hinder their mission. As their love for each other is put to the ultimate test, Ava and Austin must summon every ounce of strength they possess to overcome the sinister forces that seek to destroy them.