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. Booth was a notorious sexual harasser of young female students, so the list of suspects is long enough to make Teddy wonder if the crime will ever be solved. But when her friend, Lila, one of Booth's original accusers, is arrested and charged with his murder, Teddy begins to investigate. This creates considerable tension with Teddy's fianc (c), Sheriff Joe Rejas. He believes the ever-inquisitive zookeeper might be putting her own life at risk, and so orders her to butt out...