Insidious is a 2010 horror film directed by James Wan that explores the terrifying journey of a family haunted by malevolent spirits. The story follows Josh and Renai Lambert, who move into a new home only to discover that their son, Dalton, has fallen into a mysterious coma and is being tormented by dark entities. As the family seeks help from paranormal experts, they uncover the chilling truth about the astral plane and the dangers that lurk within it. The film is known for its suspenseful atmosphere and unexpected twists, making it a standout in the modern horror genre.