Les Misérables
It was SOOOO GOOD. Loved it and recommend it to anyone. However, if you are not familiar with the story, I strongly suggest you read this plot synopsis first -
SparkNotes: Les Misérables: Plot Overview. I heard from people who never read Hugo's original work or who never saw the musical on stage found it a bit hard to follow the characters and the story.
But even if you already know the story, it's excellent. Highly recommended.