The Great Gatsby by F. Scott Fitzgerald

This is a great book.  Typically for Fitzgerald, it is a bit sad and also accurately depicts the "roaring 20's."  Gatsby is a wonderful, sympathetic character.  Daisy is baffling, but usually in a that good Fitgerald-esque way.  The story is touching, which is a little unusual for Fitzgerald, and makes it his best book.  It's also a pretty quick read, so it is easily worth the time.