I'll spoil everything.
Bilbo and Gandalf and 10 dwarves journey to the mines of their forefathers, stolen by a wicked dragon named Smaug. Bilbo finds a short sword that glows in the dark, names it Sting. Finds a ring in a cave that lets him turn invisible. They end up reaching the town of men, on the outskirts of the mine. Bilbo sneaks in, shit happens. The dwarves get their mine back. Then a stupid war happens, a few dwarves die, Gandalf hauls ass. The End.
Saved you 12 bucks.