The final segment of a three part story about a family's upheaval and how they deal with it. It will make much more sense if you read Books I and II first.
15 year old Bobby come home from work early and catches his mother having sex with a stranger. His mother, Marie, finds out that Bobby saw her and tries to explain the circumstances but he isn't interested in her actions. Later when they are discussing her infidelity they fall into each other's arms and the sexual seduction of both mother and son begins.