As for a synopsis. I'll give a short one for the tLtWatW from memory
The Lion, the Witch, and the Wardrobe is, in its simplest, a story of four children, who stumble upon another World and their adventures.
It starts off in England, with a rather Ordinary beginning and some child-like fun and games in the large home of a old man. Of course, that also includes games involving the imagination (as is more common with children back then; modern children don't use that talent very often), and they've invented adventures that they're going to have. Alas it was poor weather and they had to stay inside.
However, while exploring the house, the youngest, a girl called Lucy (if I recall correctly) hid in a wardrobe, a large one full of fur coats. Now this wasn't a bad place to hide and she had the presence of mind to not fully shut the doors (as any wise person would know to do) and the story wouldn't have turned out to be anything if that wardrobe was made from an Ordinary tree. As it turns out, the wardrobe was not made from an Ordinary tree and as Lucy moves further back into the wardrobe, the story really begins.
Damn, now I have to hunt down my box set of the books and read them again.
My favorites were (in no particular order):
The Lion, The Witch and The Wardrobe
The Magician's Nephew
The Voyage of the Dawn Treader