In the bustling New York of the 1980s, the world of puppeteer Vincent (Benedict Cumberbatch) completely collapsed the moment his son Edgar disappeared. He was immersed in endless despair and self-blame, struggling every day and night to find the home that once laughed and laughed. Eric, the blue monster puppet drawn by his son Edgar, became the only comfort in Vincent's heart. He firmly believed that as long as Eric could get on the TV screen, the missing son who had brought him endless joy would return to him. However, on the road to pursuing this belief, Vincent's crazy behavior gradually made him lose his family, colleagues, and even the detectives who had tried to lend a hand. In the endless loneliness and darkness, Eric became Vincent's only ally, accompanying him on a long journey to find his son. This is a journey full of love and despair, which makes people can't help but be moved by Vincent's persistence and pray for the little figure who never returned.