Most believe that the rain has always been there, like the air or the soil, but one pony knows what happened 50 years ago. Written off as crazy old pegasus, Spitfire knows what really happened. She knows what is really causing the omnipotent rain that is uncontrollable by pegasi, and she intends on giving that knowledge to her grandson before it is too late.

But can this knowledge save a near-forsaken Equestria?