Chapter One Confrontation in the Chamber of Secrets

When Harry discovers Ginny Weasley in the Chamber of Secrets, he is unable to save her - that is until Tom Riddle proposes a deal. If you take her place, I will spare her. If Harry had the time to think it through, he might have thought that bad guys never make deals. What happens when Harry comes up out of the Chamber with a very intact Tom Riddle's diary? What happened to Ginny Weasley? What deal did he make in the Chamber?