The Cairn's (Sam Rockwell and Vera Farmiga) have it all: good marriage, nice apartment, a gifted nine-year-old son, Joshua, and a baby on the way. When their second child arrives, the young boy begins to resent his parents constant doting on his new sister. Suddenly, a series of tragic events fill the Cairn household with utter despair and unspeakable horror. The events leave the family questioning if it's all a series of eerie coincidences...or the calculated agenda of a sinister sibling with the perfect plan for revenge?

Sis boom bah! Vera Farmiga tells the tale of her exploding sheep.

Colin Sullivan (Matt Damon) has dinner with Madolyn (Vera Farmiga).

A distraught Bob (Hugh Dillon) leaves Irene (Vera Farmiga).

While having a difficult morning, Irene (Vera Farmiga) orders her children out of the kitchen.

Irene (Vera Farmiga) and Lucy (Caridad De La Luz) start a new job.