Being a vet, Dr. Heidi Knack already has trouble with disorderly patients and their overbearing owners. But when the beloved cat of a miserly old man is poisoned, it's up to Heidi to find out who did it. As she's desperately trying to save her license and appease her best paying patient, she stumbles upon another victim-this time a human. It's murder, mystery, and mayhem-can she solve the case before she's the next victim?