Midnight Louie series
   (see also short stories)
Crystal Days is two stories comprised of:
     1. Cat and the King of Clubs
     2. Cat and the Queen of Hearts
Crystal Nights is two stores comprised of:
     1. Cat and the Jill of Diamonds
     2. Cat and the Jack of Spades
I recommend reading the Cat and a playing card books rather than the Crystal books.

1990 - Crystal Days
1990 - Crystal Nights
1999 - Cat and the King of Clubs
1999 - Cat and the Queen of Hearts
2000 - Cat and the Jill of Diamonds
2000 - Cat and the Jack of Spades
1992 - Catnap  (Temple Barr starts here)
1993 - Pussyfoot
1994 - Cat on a Blue Monday
1995 - Cat in a Crimson Haze
1996 - Cat in a Diamond Dazzle
1996 - Cat with an Emerald Eye
1997 - Cat in a Flamingo Fedora
1997 - Cat in a Golden Garland
1998 - Cat on a Hyacinth Hunt
1999 - Cat in an Indigo Mood 
1999 - Cat in a Jeweled Jumpsuit
2000 - Cat in a Kiwi Con
2001 - Cat in a Leopard Spot
2002 - Cat in a Midnight Choir
2003 - Cat in a Neon Nightmare
2004 - Cat in an Orange Twist
2005 - Cat in a Hot Pink Pursuit
2006 - Cat in a Quicksilver Caper 
2007 - Cat in a Red Hot Rage
2008 - Cat in a Sapphire Slipper
2009 - Cat in a Topaz Tango
2010 - Cat in an Ultramarine Scheme
2011 - Cat in a Vegas Gold Vendetta

Other books:
1986 - The Exclusive,
1997 - Marilyn: Shades of Blonde
1998 - Midnight Louie's Pet Detectives
2002 - White House Pet Detectives

Short Stories:
1992 - Maltese Double Cross
1992 - Parris Green
1993 - Sax and the Single Cat
1994 - Christmas Magic
1994 - Coyote Peyote
1995 - Catch a Falling Angel
1995 - Dracula on the Rocks
1995 - Dirty Dancing
1996 - Dog Collar
1996 - Thief of Twelfth Night
1997 - Iä Iä Iä Iä! Cthulouie! / Something Fishy
1997 - A Monologue in One Act
1997 - Mesmerizing Bertie
1998 - Mummy Case
1998 - A Baker Street Irregular
1999 - Alice Holds the Cards
1999 - Night Owl
2002 - Those Are Pearls That Were His Eyes
2004 - Special Surprise Guest Appearance By . . .
2005 - Junior Partner in Crime
2005 - Strangers in a Strange Land
2006 - The Riches There That Lie
2006 - Lawn and Order