In the pine forest, there's a perplexing puzzle. The moon is getting smaller every day and Rabbit wants to know why. She asks her friend Aldrin, the raccoon. Although he doesn't have the answer to her question, Aldrin decides the issue needs a 'proper investigation'. And, because he's a bit of a know-it-all, over the course of the next few days, Aldrin dreams up a far-fetched explanation for the shrinking moon that points the finger of blame at two bumbling bears called Hubble and Lovell. In fact the bears turn out to be rather smart and it's thanks to them that the other animals learn their first fun lesson in astronomy. Join Aldrin and friends for a whodunit of astronomical proportions!