Imagine if the planets could feel, and talk, and think for themselves? Well ponder no longer, because that is what "Sincerely, Pluto" is all about. Pluto and the Sun were once close friends, writing to each other constantly, they were inseparable. Until there was a falling out and Pluto was deemed "unimportant" and "too small" by the planets, galaxy, and humans. The letters from Sun stopped. The letters from Pluto stopped. Nobody could seem to get ahold of her until she reaches out to Sun, for the first time in ages.