With weekly deadlines, writers of New York-themed television shows like "Law and Order" were forced to start dealing with Sept. 11 long ago. But because of the slow pace of publishing, the first New York mysteries written (or revised) post-attack are just starting to appear, among them "The Bone Vault," the fifth in Linda Fairstein's Alexandra Cooper series; "Small Town," by Lawrence Block, author of the Matthew Scudder series; and Evan Hunter's latest 87th Precinct novel, "Fat Ollie's Book," written under the pen name Ed McBain.