Norma and Arthur Lewis are faced with a terrible dilemma when a mysterious glass box turns up at their door. If they press the button inside the box, they’ll get enough money to save their ailing son, but in exchange, someone, somewhere in the world will die. When the temptation to save their beloved son becomes too much to bear, Norma pushes the button. Immediately, a gunshot rings out somewhere nearby. Consumed with guilt, Norma must do everything in her power to solve a murder she has knowingly caused.