City of Dark Hearts
The novel was re-published as City of Dark Hearts by James Conan in June 2008, by Arrow. It "is a shortened and revised edition". (City of Dark Hearts. Arrow Books, 2009. T.p. verso.) The ISBN is 9780099502173.
The "back matter" in City of Dark Hearts includes the Acknowledgements, a copy of a 2007 interview with both authors, a short article from the Oxford Times of March 2007, and a piece They Told It Like It Is: The Real American Newspaperwomen Who Inspired A Novel by William Horwood and Helen Rappaport.
Reviews and articles:
Publisher and bookseller listings:
In May 2007, Helen Rappaport had posted that Dark Hearts of Chicago "will be published by Pocket Books in the USA early next year  though in a shorter version than the UK version, and probably under the title City of Dark Hearts." [Comment posted by Helen to Dark Hearts of Chicago posted May 9, 2007 in Bluestocking Reader: Weblog of Lisa Guidarini.]
Die Stadt der dunklen Herzen by James Conan is the German edition of City of Dark Hearts, and was published in July or August 2008 with the ISBN 3453470877 or 978-3453470873 (ISBN-13).
The French edition Dans L'Ombre de la Ville was published in 2009 by France Loisirs.
Dans L'Ombre de la Ville on Encre Noire
First in a series
Dark Hearts of Chicago was to be the first of a series, and the second was originally intended to be published in 2008. According to a 2007 answer in the Frequently Asked Questions at horwoodrappaport.com the authors had originally planned to be "delivering No 2 in the series in October 2007 for publication by Random UK in Spring 2008."
[Frequently Asked Questions at http://www.horwoodrappaport.com/faqs.html Retrieved October 1, 2007.]
The Codburg Conspiracy by James Conan
The Codburg Conspiracy by James Conan was due to be published in May 2011 according to a Eurocrime Future Releases list online[http://www.eurocrime.co.uk/future_releases_by_name.html Retrieved March 28, 2011.] (previously announced for May 22, 2009) by Hutchinson as a hardover (304 pages) with the ISBN 9780091796631.
The Codburg Conspiracy by James Conan on Waterstones.com was listed as Publication Abandoned by early 2012.
http://www.waterstones.com/waterstonesweb/displayProductDetails.do?sku=5978811 accessed January 8, 2012.