A young couple, Norma and Arthur Lewis, residing in suburban Virginia in the 1970s, face a moral dilemma that changes their lives forever when they receive a mysterious package on their doorstep. Inside the package is a wooden box with a simple button. The arrival of the suave and disfigured stranger, Arlington Steward, reveals the box's unsettling purpose: if the button is pressed, they will receive $1 million, but someone they do not know will die as a result. Struggling with their financial situation and the ethical consequences of their potential decision, the couple is torn between the temptation of instant wealth and the moral high ground of not causing harm to another human being.

The narrative intensifies as the couple delves deeper into the mystery behind the box and its origins, discovering it is part of a larger, more sinister experiment that tests the bounds of humanity's morality and greed. Their decision sets off a series of unforeseen events that unravel their reality and challenge their perception of free will and personal responsibility. As they navigate the consequences of their choice, they begin to question everything they know about themselves, their relationship, and the world around them, revealing the deep complexities of the human condition and the profound impact of their decisions on their future and the lives of others.