Ender's Game by Orson Scott Card is an excellent read because of the suspense, interesting characters, and a plot that always pulls you into the story.
First, the author filled this book with suspense and mystery. It has the most exciting ways to drag you into reading on. Once the book has you in that place, it surprises you some time with instant action and sometimes with a more slow and suspenseful action (Mysterious Teacher).
Second, this book incorporates lots of interesting characters that were real people. Take Peter for instance. He is a character that seems right to everyone in the story, but you're the only one that knows who he is. Also, there are numerous other interesting figures in the book. These characters are always interconnected in a way to the main characters.
Third, the story drags you to read more. It is long enough to keep you reading so that it can bring up some more actions to keep you reading again. It's like a never-ending cycle to gain your interests. It always brings something up that gets your attention. In my case, just when you think the fighting is over, a surprise attack comes.
In conclusion, Ender's Game is a must read when you have the time.