A grieving scientist, Lee, leads his team in the creation of an Artificial Intelligence modeled after his dead wife. When the AI experiences the sudden death of the elderly companion she was created for, she is unable to move on and starts to break down. Rather than risk losing her, Lee reboots her in an effort to erase her memory of losing her companion. In order to maintain their connection forged by the common experience of loss, Lee decides that the reboot will be done by erasing and replacing one memory at a time, each of which includes him. Driven by fear of loss, his grip on reality and ethics deteriorates when he is left with an insatiable desire to preserve her essential identity.