Seven years after her husband vanished, a woman prepares to declare him legally dead, only to discover a sinister tunnel near her home that may explain the disappearances. Blending psychological grief drama, supernatural menace, and folkloric horror, Absentia became Mike Flanagan’s breakout indie, fusing grounded emotion with chilling, otherworldly mystery.

One of the most frightening horror films of recent years, ABSENTIA is the critically-acclaimed, multi-award winning breakthrough film from the director of OCULUS.

Tricia's husband Daniel has been missing for seven years and with the support of her sister Callie she finally declares him legally dead 'in absentia'. As Tricia tries to move on with her life she becomes haunted by terrifying visions. Callie meanwhile is drawn to an ominous tunnel near the house with links to other unexplained disappearances. Does the key to Daniel's fate lie in the cold darkness of the tunnel and could the horrific truth be something far worse than death?

Från IMDB:
A woman and her sister begin to link a mysterious tunnel to a series of disappearances, including that of her own husband.