A simile is a figure of speech involving the comparison of one thing with another thing of a different kind, used to make a description more emphatic or vivid. Now, you simply have to find the simile, and think about how you can interpret it. Since you did not attach the excerpt I can’t answer but at least this is how to do it.
They aren't at the castle he said "I saw you at the castle" They are looking for a oak tree they aren't there yet. It wouldn't have been a long time ago on the balcony.
