Here is the list of all the novels and novellas set in the Rogues' World:

AN ARRANGED MARRIAGE, Jul 1991
AN UNWILLING BRIDE, Feb 1992
CHRISTMAS ANGEL, Nov 1992
FORBIDDEN, Mar 1994
DANGEROUS JOY, Nov 1995
THE DEMON'S MISTRESS, Mar 2001 ** (a novella)
THE DRAGON'S BRIDE, May 2001 **
THE DEVIL'S HEIRESS, Aug 2001 **
HAZARD, May 2002
ST. RAVEN, Feb 2003
SKYLARK, May 2004
THE ROGUE'S RETURN, Mar 2006
TO RESCUE A ROGUE, Sep 2006
LADY BEWARE, Jun 2007
A SHOCKING DELIGHT, Apr 2014
TOO DANGEROUS FOR A LADY, Apr 2015

** These three stories are available in an omnibus edition: THREE HEROES, Jun 2004.

The following two novels are set in the Regency world inhabited by the Rogues, but with new characters and only slight connections:

THE VISCOUNT NEEDS A WIFE, Apr 2016
MERELY A MARRIAGE, 30 May 2017

[Sadly, Jo passed away in May 2016, so unless there's something lurking in her archives, there are no more Rogues' World tales to come...]