The story of Ruth is about how God is at work in the circumstances and lives of ordinary people to restore what is broken - to bring rest to the weary, fullness to the empty, hope to the hurting. He is making all things new.
But the beginning of this story is one of weariness, tragedy, and loss. We see in chapter 1 that our weariness comes from circumstances beyond our power and decisions within our power. But rest comes from the God of all power.