I was conquered by psychology Ender, from the first pages. See grow this private boy's childhood, too smart and too mature for her age, and yet to thank you adults (although ...) was a delight. The story is full of twists panting, the closed universe immersive, believable characters all. Card has a magical pen to describe the relationships and human interactions. Because before being a brilliant science fiction novel, "Ender" is primarily the story of a boy who struggles against himself.
The following volumes are very different, but very interesting and a logical consequence of the life of Ender.
