Grieving the tragic loss of their young daughter Penelope, scientists Jonas and Elizabeth delve into the world of artificial intelligence to recreate their beloved child. As they work diligently to assemble Penelope's essence from fragmented memories and precious mementos, their relationship is tested. Elizabeth becomes increasingly doubtful about their likelihood of success, while Jonas conceals a haunting secret.

A little girl draws pictures of a red-eyed monster, while her young mom anxiously suspects a malicious presence around their home. Then a stranger appears at their door.