This thesis is an investigation into the free will debate and the problem of free will. Is free will and moral responsibility possible in a determinate universe? As old as this problem is, philosophers are still grappling with it and the debate on this issue is still very much alive. How we address this problem depends on what definition of freedom we use, and it depends on whether we relate the concept of moral responsibility to freedom or not. I argue that the position called hard incompatibilism is the position that coheres best with naturalism given the definition of freedom I support. By naturalism, it is meant a view that doesn`t contradict natural sciences. I aim for an understanding of action and morality that doesn`t introduce any ...