In a small town in New England, where time seems to have stood still, the life of Clara, a young and devoted nurse, takes an unexpected turn after the surprise return of her sister Mia, who has been absent for years. Mia comes back with an enigmatic air, and as they reintegrate into their daily routine, Clara begins to notice disturbing changes in her sister. In her mind, Mia has found a mysterious purpose, a new spiritual path that distances her from her family ties.