God sends Moses right back to Pharaoh. This time God tells Moses that Pharaoh will not listen, even though God gives Moses a special sign to perform. In fact, God tells Moses, "I will harden Pharaoh's heart" so that God can display his mighty power throughout Egypt. And just as God told Moses, Pharaoh's heart is hardened. He refuses to listen, setting up the awesome display of God's power that is about to be inflicted on the people of Egypt.
In all this, we are reminded that God is sovereign. Things may not go as we think they should, but that does not mean God has lost control. He might be setting things up to show us his mighty hand. Trust him.