The otter of death

"While taking the yearly otter count at a marsh near Gunn Landing Harbor, California, zookeeper Theodora Bentley sees Maureen, her favorite otter, swimming around clutching someone's expensive smartphone. When Teddy rescues the device, she discovers a photograph of a murder-in-progress. A hasty search soon turns up the still-warm body of Stuart Booth, PhD, a local Marine Biology instructor"--Amazon.com.