Marne Davis Kellogg
Lilly Bennett, an ex-cop private investigator in Roundup, Wyoming:

Bad Manners (1995)

Curtsey (1996)

Tramp (1997)

Nothing but Gossip (1998)

Birthday Party (1999)

Kick Keswick, master jewel thief who worked for an auction house in London, England for 30 years, now retired to Provence, France:

Brilliant (2003)

Priceless (2004)

Perfect (2005)

Friends in High Places (2007)

The Real Thing (2013) [ebook]

Non-series romantic suspense:

Insatiable (2001)