The first sequel to the highly successful 1979 film 'The Amityville Horror', 'Amityville II' is actually a prequel, telling the story of the family that lived in the house prior to James Brolin and Margot Kidder. We get some information about this story in the first film, though this movie fills that out considerably.
A Catholic family of six, disturbing occurrences start the day they move in, but patriarch Burt Young doesn't want to see it. While Burt is more or less lapsed, his wife Rutanya Alda is not, she takes 3 of the 4 kids to church and requests that gay coded Father James Olsen visit and bless the house. Father Olsen comes and at first, he is not sure if there are supernatural issues with the house, or if it's family disfunction resulting in the awkward vibes of the place. In time the priests' concerns about malevolent forces grow, but not in time to prevent oldest son Jack Magner from slaughtering his family, after having incestuous relations with his sister Diane Franklin.
In its second half the film becomes an Exorcist knock off. This movie is pretty bad, with increasingly hectic pacing employed in the hopes that the viewer won't notice this. James Olsen is the standout performance, doing a sort of Father Karris schtick; the most expertly executed part of the whole film is the way they subtilty handle Olsen's sexuality, it's never overt, but his close relationship with a handsome congregant suggests the father is tempted, though not necessarily that he's given in.
The movie takes advantage of its larger budget to its predecessor, and at times it goes pretty wild with the makeup and effects. At 104 minutes its maybe slightly too long. though some of the film's most intriguing characters such as Moses Gunn's detective and Leonardo Cimino's Dean aren't given much time and feel underused. The film has an exploitative stink too it and is often schlocky in a bad way. I don't think it knows what it wants to be, beyond being a cash grab. *1/2 with the 1/2 star being for James Olsen's performance.