Dr. Bennet Barinson, a respected psychiatrist in his early forties, calls Laura Massey to warn her that her life is in danger. Her husband Walter, Barinson's patient, suspects Laura of infidelity and plans to kill her and her lover. Barinson's warning grows into a secret affair from which he struggles to escape. Set in a mental health clinic, A WARNING is the story of Barinson's conflicts, culminating in a fateful conclusion.