Cymbeline by William Shakespeare
I found Cymbeline fairly disappointing. It seemed to me to be a mishmash of various Shakespearean plot devices that had been used to better effect elsewhere in his plays, 'Othello' and 'Macbeth' being ones that spring to mind. It all seemed a little far fetched and really random, which I was warned about when it was recommended to be fair. But it's one I think I'll definitely need to read again in order to fully appreciate, or even just understand it.