Answer:
Well if the meaning of the theme of a story is what the author is trying to convey - in other words, the central idea of the story, then the theme of the story would probably be that "What is done in the dark always comes to the light", which means that when you go behind others backs and do something wrong, sooner or later it will come up, and you will be what they call "punished" what happens in the story that makes me believe this would be the life lesson the mouse had got taught (something like that)
** let me know if this helps... i got stumped too**
(Brainliest when possible if i got it right)