Dr. Steven Murphy is a highly respected cardiovascular surgeon who lives a seemingly perfect life in a pristine suburban home with his wife and two children. However, at the edges of this idyllic existence, there is Martin, a troubled teenage boy without a father. Martin begins to infiltrate the doctor’s life in increasingly disturbing and unexpected ways, gradually revealing a dark and unsettling presence. As Martin grows closer to the family, the boundaries between their carefully constructed world and the dangerous secrets he brings begin to blur, setting the stage for a series of events that will challenge the stability of their lives.