What is the main conflict in Winter Prey by John Sandford?

A sociopath named "The Iceman" goes to the family home of Claudia and Frank LaCourt, kills the entire family and burns the house to the ground. The man is looking for a photograph of himself with a young boy, one that was published and could ruin him if discovered. The LaCourt's daughter, Lisa, had a copy and showed it to her parents. The boy in the photo had been found dead.