Lydia Adamson: Dr. Nightingale Enters the Bear Cave (USA 1996)

From the Publisher:
Veterinarian Deirdre "Didi" Nightingale is happily taking a break from her practice to join a research team tagging pregnant black bears in the northern Catskills. Awaiting her are the thrill of adventure, the fun of taking her friend Rose along -- and murder.

Lydia Adamson: Dr. Nightingale Enters the Bear Cave. A wildlife expedition leads a spunky vet to a most unnatural murder... Signet, ISBN: 0451186737 (January, 1996), 247 p., $5.50.