If you're interested in the battle and your only knowledge is derived from watching Charlton Heston, Henry Fonda, and Glenn Ford in the bitchin "in Sensurround" movie
Midway (which I saw in the theater in 1976...), I highly recommend the book "Shattered Sword". Get it at
http://www.amazon.com/exec/obidos/ASIN/1574889230/bookstorenow600-20, or review the book's website at
http://www.shatteredswordbook.com/index.htm.
I read it at the beach last summer, and is a great example of a well researched effort using primary sources, especially Japanese, to lay out the complete story. It's a bit thick (600+ pages), but reads quickly. Unlike most books, it focuses heavily on the Japanese decisions and actions.