Jim Hawkins gets a treasure map, and Dr. Livesly, Long John Silver, and a whole lot of others go out to look for the treasure. Then, Long John Silver, and most of the other guys turn against them! I think you should read the book to find out what happens.
I really like Treasure Island. I think that it is one of the best books I ever read. The movie skips a lot of it, and changed a few parts. I think this is a very good book for someone to read.