Professor Jim Carlton, wracked by PTSD due to the death of his parents and the suicide of his wife, encounters a former student who wants help purchasing a handgun. The young man claims he only wants to scare a sexual predator, but in truth he plans to commit murder. As events spin out of control, Dr. Carlton believes he is receiving messages from his deceased wife, warning him to expect a near-death experience. Are the warnings all in his head? Or...