Retired psychiatrist Gloria Lamerino is back in her old stomping grounds, Berkeley California but the joy is short-lived when the shooting death of an emergency medical technician is connected to the women's fiance, Philip chamber. The Missing Link is a duffle bag picked up by the EMT as she arrived at the emergency room with her fatally wounded patient, scientists develop and highly classified research on nitrogen. The dead scientist was Philip Chambers colleague. Now the bag, in his contents are missing. And so is chambers. Aware of the dire consequences of weapons grade nitrogen fallen into the wrong canes, Gloria feels the worst as she tries to piece together a conspiracy that threatens National security, her best friend's happiness in her own ability to stay alive.