House Next Door; Anne Rivers Siddons

The protagonists don't particularly like their new neighbors, a young couple builing a contemporary house next door. The young girl is pregnant and already making plans to include their neighbors in raising the child. The protagonists, Colquitt and Walter Kennedy do like and become friends with the architect and builder of the house. Scandle hits the new neighbors, the wife falls and has a miscarriage. Then while they are throwing a party the husband is caught having sex with a male coworker in their bedroom. They divorce and move away and the next couple moves in a woman who is still trying to recover from the loss of their son in vietnam. The house starts playing with her, she keeps getting phone calls and believes her son is still alive. The husband has a cousin of the wife come and take care of his wife. The wife slowly recovers only to find her husband having sex with her cousin on the couch and becomes catatonic. They move away. The next couple has a small child who suddenly becomes very ill in the house. The husband, who is an obsessive compulsive narcissist snaps and kills the family then himself. Colquitt and Walter don't want anyone else living in the house and the architect decides to live in it himself. After he tells them his story on why other things he has tried to build have fallen through the neighbors realize there is something in the architect that is creating all the evil...and they decide to get rid of it.