Introducing the newest Clinical series: Unit on the Brink: Voices from the COVID Frontline. This multi-part series delves deep into the stories behind the health care workers at University Hospital as they hold the line against the COVID-19 pandemic. Their stories offer a snapshot of the virus bearing down on one state, one group of healers, one Medical ICU. Reported by Stephen Dark, listen as these medical professionals stand united in their sense of a calling even as they risk their lives against an invisible threat.