Julia Sullivan Patricia Mickey is a young schoolteacher for deaf children living in Savannah, Georgia, whose memories of childhood haunt her. Those memories center on her sadistic twin sister, Mary Allison Biggers, whose cruelty left an indelible mark. At the urging of her uncle, James Dennis Robertson, a local Catholic priest, Julia agrees to visit Mary, who is confined to a mental institution. The reunion is tense and dangerous, and Mary vows to make Julia “suffer as she had suffered.”
As their shared birthday nears, Julia discovers that Mary has escaped the institution. A chilling string of deaths begins to unfold in the house Julia calls home, with several neighbors and friends meeting gruesome ends. A menacing Rottweiler appears in the attacks, quietly stalking victims and leaving a trail of fear behind it. One of Julia’s students, Sasha Robertson Jr. Richard Baker, is killed in a park by the same ominous dog, deepening the sense that something dark is closing in on Julia.
Paranoia grows as Julia suspects someone—perhaps Mary—has found a way to hide within the walls of her own home. The pressure mounts when her psychologist boyfriend, Sam Edwards Michael MacRae, is seemingly pulled away by a business trip to San Francisco just as trouble reaches a peak. Yet fate has other plans, and the house grows stranger and more dangerous by the day.
The tension shifts to the basement, where the landlord Amantha Beauregard Edith Ivey reveals she’s helping with a “surprise” for Julia, only to realize she has walked into something monstrous. In the basement, Father James’s cruel setup comes to light as he stashes corpses in the dim space, including the bodies of Helen Morgan Hart and Amantha. The night ends with a confrontation that ends in tragedy for Amantha and a grim sense of what Julia is up against.
On Julia’s birthday, James returns to the house with the intention of completing his ritual. He blindfolds Julia for a supposed surprise, leading her into the basement where the horrifying tableau sits. When Julia tries to escape, she is caught up in a deadly confrontation with her uncle, and she kills him with a hatchet. The threat from the past seems to intensify as Mary momentarily returns to life, attempting to strangle Julia with one last, eerie warning: Julia “will never be free.” The film closes on Julia’s tears, leaving a lingering sense of dread and a final nod to a line attributed to G. B. Shaw.
