Possession is a haunting story of love, illness, and the unseen forces that feed on suffering. Claire is fighting to save her best friend Autumn from a mysterious, undiagnosed illness, but the healthcare system offers nothing but silence. As Autumn's nightmares worsen, an ancient occult book hints at watchers drawn to despair. When Claire’s estranged father arrives with talk of holy rituals, reality begins to unravel. With time running out, Claire must decide what to believe, and what she’s willing to sacrifice to keep Autumn alive.