Wynne Lynch resigns from her position with Mr. Griffin as a chemical leak traps her and another man, Nathan, inside a locked lab. The poison gas intensifies, forcing them to confront their mortality as only one has a gas mask, leading Nathan to urge they face death together. Wynne pleads to be let out, revealing a promise to care for Nathan's younger brother Nolan for seven years. Nathan dies before rescue arrives, and Wynne survives, left to honor her vow while grappling with the loss and the locked voice recorder containing Nathan’s final message, set to open in seven years.