The Courts of Chaos, it is all within the title. As the Corwin cycle of the series comes to a close, it opens the story up for the Merlin cycle to continue. Within the Courts of Chaos, the world is being destroyed, as Corwin races to create a new pattern and save his precious Amber; trouble finds him.
Corwin has come full circle, from everything that happened in book one all the way up to book five. It all makes sense to him. He knows who was involved in it all. He figures out that his family is even more devious than he thought they were, as one of them fakes their death. Another continues to grow mad and the others are lost in a tangle of mischief.
As the book ends, Corwin has been met up with Merlin and takes him to walk the pattern he has created off in Shadow and finally understands his own father.