This movie is based upon the novella of the same name by Stephen King.  It has a special place in my heart because it was the very first thing by King that I ever read, and it sunk its hooks into me so deeply that I've been a fan of his ever since.

The movie follows the novella fairly closely (as I recall - it's been quite a while since I've read the novella) up to the breakout from the grocery store.

In a (very brief) nutshell, the story is as follows:

A small Maine town is hit by an extremely strong thunderstorm one night.  The next day, as part of cleaning up, an artist and his young son, along...