A spree killer who leaves his victims tied up with neckties torments the men of Atlanta in the fall of 2002; as investigators hit many dead ends, one clue left behind could be the final puzzle piece detectives need to tie these cases together.

In 2004, three separate murders carried out over two weeks confound California police after they discover the culprit used the same type of gun; detectives first suspect robbery, but as they dig deeper, they unearth a darker motive.