Alice Nestleton
1. A Cat in the Manger (1990)
2. A Cat of a Different Color (1991)
3. A Cat in Wolf's Clothing (1991)
4. A Cat in the Wings (1992)
5. A Cat by Any Other Name (1992)
6. A Cat with a Fiddle (1993)
7. A Cat in a Glass House (1993)
8. A Cat with No Regrets (1994)
9. A Cat on the Cutting Edge (1994)
10. A Cat in Fine Style (1995)
11. A Cat on a Winning Streak (1995)
12. A Cat Under the Mistletoe (1996)
13. A Cat in a Chorus Line (1996)
14. A Cat on a Beach Blanket (1997)
15. A Cat on Jingle Bell Rock (1997)
16. A Cat on Stage Left (1998)
17. A Cat of One's Own (1999)
18. A Cat With the Blues (2000)
19. A Cat With No Clue (2001)
20. A Cat Named Brat (2002)
21. A Cat on the Bus (2002)

Deirdre Quinn Nightingale
1. Dr. Nightingale Comes Home (1994)
2. Dr. Nightingale Rides the Elephant (1994)
3. Dr. Nightingale Goes to the Dogs (1995)
4. Dr. Nightingale Goes the Distance (1995)
5. Dr. Nightingale Enters the Bear Cave (1996)
6. Dr. Nightingale Chases Three Little Pigs (1996)
7. Dr. Nightingale Rides to the Hounds (1997)
8. Dr. Nightingale Meets Puss in Boots (1997)
9. Dr. Nightingale Races the Outlaw Colt (1998)
10. Dr. Nightingale Traps the Missing Lynx (1999)
11. Dr. Nightingale Seeks Greener Pastures (2000)
12. Dr. Nightingale Follows a Canine Clue (2001)

Lucy Wayles
1. Beware the Tufted Duck (1996)
2. Beware the Butcher Bird (1997)
3. Beware the Laughing Gull (1998)