Spoilers

http://en.wikipedia.org/wiki/Silent_Hill:
Silent Hill exists as a multiverse consisting of reality and two alternate dimensions which are uninhabited by people: a foggy dimension and a dark dimension called the “Otherworld”, where a partial lack of application of physical laws occurs. The Otherworld’s form varies, but is most frequently based on the fictional rural American town of Silent Hill, and the series’ characters experience delusions and encounter tangible symbols of elements of their unconscious minds, mental states, and innermost thoughts when present in it. The origin of these manifestations is a corrupted power native to Silent Hill, which materializes human thoughts; this force was formerly non-evil, but was twisted over by the occurrence of certain events in the area. The alternate dimensions are explored by the player characters, with occasional transitions between them.

Another obstacle in Silent Hill is a religious organization called “The Order”. The Order has certain members who keep its identity concealed, maintaining a false public image as a charity organization which operates an orphanage. The organization is officially named “Silent Hill Smile Support Society”, sometimes abbreviated “4S”, with “The Order” being a nickname. The religion followed by The Order focuses on the worship of a chief deity. The organization’s dogma is derived from a myth: the deity set out to create paradise, but ran out of power during the process; she will someday be resurrected, thus becoming able to finally create paradise and save mankind. The Order repeatedly participates in illegal acts: ritual human sacrifices whose purpose is the deity’s resurrection, illegal drug trade, and kidnapping and confinement of children in a facility to teach them its dogma through brainwashing, while presenting the facility as an orphanage.

One more staple plot trait in the Silent Hill series is the presence of two plot themes: the theme of a main protagonist who is what is widely believed to be a regular person, or an “everyman”, and the theme of a main protagonist searching for a missing person they love.

Spoilers

Silent Hill 2: Strangers in the Night Jp12x