The Last Song is the final novel of The Blue Child Series. In this book Ruby, Agnes and Blue are pursued by the evil Lilin as the two sisters and the Star Child try to return to the House of the Mother. Grace, the third sister, is in another dimension helping the children stolen generations earlier by soldiers near the border of the United States and Mexico. Among the Lilin a potent force is at work - an old entity has been called. Timing is everything in a complex ceremony reaching across the dimensions of time and place.