What is "aparichithan"

Aparichithan (Malayalam : അപരിചിതന്‍) is a 2004 Malayalam horror film directed by Sanjeev Sivan in his directorial debut. It stars Kavya Madhavan, Karthika and Manya in lead, Mammootty appears in an extended cameo role. The plot centers around Ouija board and spiritualism. Music was composed by Suresh Peters, while Peter Hein choreographed the action sequences.