book card

These twins, boy and girl, and then are the last two people on Earth (or at least that''''s what they thing their planet is) and these two take turns secretly writing a letter to this "other person" they never met but they both are in denial towards each other saying "Ain''''t no way, we are the only ones left". But deep down inside and secretively they both constantly write the letters and tell this "other person'''' what they''''ve been through and stuff. But then the boy gets taken by this "other person" turns out he/she was a robot from the future seeking to destroy them both and it''''s up to the girl to save her brother and destroy that robot and all the other robots (later in the story more robots come)...