Alison has always hated Christmas, but her holiday season gets worse when her mother calls and tells her she only has a few weeks to live. Wanting to repair their relationship, Alison agrees to take in Mavis despite Alison's traumatic memories of her abusive alcoholic mother. Instead of healing the relationship, Alison begins to realize her mother is not who she thought. Suspecting her mother is possessed by a demon, Alison must decide how far she is willing to go to save her family from this nightmare.

Jennifer McMahon has penned an atmospheric slow-burn horror story that will give you chills. At first, Ali discards her worries since everything is just a shade off, desperately wanting to believe she's imagining it. By the time Ali realizes the truth, everyone now thinks that Ali is the problem, setting up a cat-and-mouse psychological game that keeps you on edge throughout the second half of the novel.