original_query: What is the plot of The Mountebanks?
query: What is the plot of the opera The Mountebanks?
answer: The opera revolves around a magic potion that transforms those who drink it into whoever they pretend to be.  The main characters pretend to be various roles (Duke and Duchess, Hamlet and Ophelia, etc.), leading to humorous situations and consequences.  Eventually, the potion's effects wear off, and everyone reverts to their original personalities.