| Director | Soi Cheang |
|---|---|
| Box office | HK$4.6 million |
While playing paintball at Mount Davis, a man named Sam encounters a ghost of a faceless woman in a red dress and her baby and becomes catatonic.
Mavis, a reporter from American TV Net, is shown around Metrobroadcast FM99.7 by Brian, who takes them to see the office of Horror Hotline, a radio talk show about the supernatural that is hosted by Ruth and Edmond and produced by Ben. Ben takes the video crew to an interview the radio show is doing with the medium Auntie Ying, who tells Mavis not to get too nosy. Mavis films the hosts talking to Chris, who tells them a story of how he and his six friends saw a "big head baby" in a cage near his boarding school in the Western District in September 1963. The next day, the crew finds eight pages of online bulletin board messages and 27 phone messages from listeners with their own stories about "Big Head". One caller says that the big head baby was a real baby born in the early 1960s who could stand up and talk like an adult just after it was born and that it fell from its bed and died. Mavis finds the address of the school Chris attended, and the two crews head to the school to investigate. They meet Connie, the adoptive daughter of the Iranian former principal of the school. She says that seven students including Chris previously visited her father.
Ben's girlfriend Helen has dreams and visions of the boy she aborted without telling Ben. Sam is admitted to the hospital where she is a nurse. That night, he sees the ghost of the woman in the red dress again. The next day, it is steamy hot in the studio, though the technician says that the air conditioning is functioning normally. Chris calls in, but they only hear laughter on the phone. The hosts go silent and motionless, and Ben kicks out the reporters. Ruth says that they felt like there was another person in the room with them. Later, boom operator Mike watches the video of that moment and is shocked.
The next day, Mike's wife Liza calls Mavis and says that Mike has gone missing. Ben, Mavis and the cameraman Dave watch the video again and see that a man with glasses can be seen next to Edmond in the video. Connie identifies the man as Chris and says that she saw him going to her father's room in the hospital that morning before she witnessed her father die. At her own hospital, Helen talks to her new patient as if he were her son and helps him draw a picture that looks like a baby with a big head, though nothing is actually visible on the paper. Connie, Ben, Mavis and Dave visit Chris's old school and find a newspaper article about a woman giving birth to a big head baby at a Western District hospital. They also find an article stating that six of the seven former students whom Connie saw visiting her father committed suicide at a factory in the Western District, but then a ghost sets fire to the newspapers.
Mavis gets a call from Mike, who says he is in a storage unit in the Western District. She keeps talking to him on the phone until they find his dead body with his blood creating a picture of a six-headed baby on the wall behind him. The police tell Mavis that Mike had already been dead for 12 hours when she found him. Ben proposes marriage to Helen. Helen sees a vision of her aborted child as she tries to go to sleep.
Mavis interviews Karen, a nurse who heard the big head baby's adult-sounding voice after its birth in 1961 when it was taken away in a cage by the police. When they enter the room where the baby was born, Dave's camera mysteriously dies. Mavis hears the voices of the nurses during the delivery, but cannot see anyone. At the other hospital, Helen calls Sam "Big Head", then calls Ben and says she is leaving, confessing that she aborted their baby.
Mavis takes Auntie Ying to the storage unit, and Auntie Ying summons the spirits of the six dead children. Ben touches the ghost of the big head baby, and Auntie Ying dies. The police tell Mavis that they found a fingerprint on Mike's glasses from Chris Kwan, who died three years earlier.
The theatrical ending shows Mavis interviewing Sam, who tells her about his encounter with the faceless woman and the caged baby at Mount Davis. The rest of the ending is shown as a video recording from the point of view of Dave's camera as Ben, Mavis and Dave go to Mount Davis and find the baby's cage as well as Helen. They are then attacked by the faceless woman.