What is the main conflict in The Death of Superman by Dan Jurgens?

The Death of Superman is the story of Superman's confrontation with his greatest enemy, the beast called Doomsday. The beast will be unrelenting and single minded. The only hope that Superman has is to give everything he has in order to stop the monster and save those he loves. Superman will have to fight not just for his life, but everyone's lives when Doomsday arrives.