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"On a snowy winter night, a thin young man named Mikael wandered outside Stockholm. After he was rushed to the hospital, the hospital suddenly discovered that this man had been listed as "dead" seven years ago because he was the notorious serial murderer Jericho. One of Walter's victims. Thirteen years ago, he and his young sister disappeared. Mikael told the police that his sister was still alive and imprisoned by a man he called "The Sandman"... Detective Jonah Linner wanted to capture Jericho. Although he has sacrificed everything and brought Jericho to justice and ordered him to serve a life sentence in a mental hospital, the police detective has always believed that Jericho still has an accomplice... The chance of saving Mikael's sister depends on letting Jericho speak. The only one who can do this is agent Saga Ball. She will have to go deep into the mental hospital as an undercover agent to defeat him in the game designed by Jericho... Whoever can persist to the end, who is more perseverant, will have the last laugh. "

Sweden's National Crime Agency received a voyeuristic video of a young woman undressing unknowingly in front of the camera... And the woman's body was later discovered. With the arrival of the second video, police learned the killer was toying with them. Detective Jonah Linner, who has just come out of retirement, begins investigating and meets his old friend Eric Maria Barker, a hypnotist and trauma expert. Buck himself is very wary of forcing others to reveal secrets, but it turns out that this time it's Buck himself who has something to hide. Years ago, his testimony landed a man in jail for a similar horrific crime. Now, he's starting to think that there might be innocent criminals behind the bars, while a serial killer is still on the loose.