on Live Write Thrive:
Novelists focus heavily on plot, and rightly they should. Your novel needs a well-crafted and believable plot. A good story will have one. A great story will have many plot layers. You could call them subplots, but I find it helps to think of them as layers because of the way they work in your story.
If you feel your plot is thin and narrow, consider adding layers of plot.
Plot layers come in all thicknesses of importance, and if they are designed carefully, they will make your story a rich one with unique and lasting flavors that will linger long after your reader finishes your book.