Regression takes place in a time Satanic Cult paranoia burst out in the US. A young girl who was sexually abused by her father takes a shelter in a church. As the investigation begins, more hideous truth about a secret cult reveals. But after that point the line between the reality and fantasy becomes more blur. Director Amenabar (Agora) masterfully portrays how media and beliefs can be deceptive and mass hysteria easily will warp the truth.