Jess, a recently divorced nurse and mother, relocates to her childhood farmhouse with her teenage daughter, Tyler, and her eight-year-old son, Owen. One evening, their dog detects something unusual in the forest and chases after it. A few days later, the dog comes back and viciously bites Owen before Jess can stop it. Owen is taken to the hospital, but his health continues to decline, leaving everyone puzzled—until Jess uncovers a shocking remedy.