Falling Man pertains to the man, caught by the camera, who jumped, head first, from one of the towers of World Trade Center on that fateful day of September 11. For this novel, it also pertains to the performance artist who mimicked that man.
This is a novel that examines what happened to a survivor's family immediately following that tragedy: how it changed them and how they coped to move on.
Like any De Lillo novel, this is so well written and, at times, poignant.