"Son, What Have You Done?" is a psychological horror film. In addition to the director and producer, the cast is also quite strong. After Michael Shannon, Willem Dafoe and Chloë Sevigny joined the film, Michael Pena, Brad Dourif and Bill Cobbs have recently confirmed their roles. The plot of this film is based on a true story. A man in San Diego experienced a series of inexplicable magical events. A strange idea led him to brutally kill his mother with a knife. Herzog said: "I have always wanted to make a horror movie, but I don't want to show it as bloody axes and chains. I hope the audience will feel an inexplicable fear from it."