The Twin Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

The Twin Plot Summary and Synopsis

Following the aftermath of a tragic accident that claimed the life of one of their twins, Rachel and Anthony relocate to the other side of the world with their surviving son. What begins as a time of healing in the quiet Scandinavian countryside soon takes an ominous turn when Rachel begins to unravel the torturous truth about her son and confronts the malicious forces that are trying to take hold of him.

Source: Wikipedia (CC BY-SA 3.0).