With its controversial subject matter, and its TV-famous lead, "Blackbird" was always a lock for most talked-about play of the summer. (CSI's Gil Grissom plays a child molester? Juicy!) But according to critics, we should be talking about this Chicago premiere because it's good. Mattie Hawkinson co-stars as Una, the young woman unable to let of William Peterson's Ray, or what happened between them when he was 40 and she was 12.