After the loss of her husband, a woman seeks solace with her in-laws in their secluded family home. As one by one they are transformed into Deadites—turning the gathering into a family reunion from hell—she comes to discover that the vows she took in life... live on even in death.

A reunion between two estranged sisters gets cut short by the rise of flesh-possessing demons, thrusting them into a primal battle for survival as they face the most nightmarish version of family imaginable.