The Diagnosis is Murder (A Dr. Valorian Mystery, #1)

Laura Valorian is an emergency room physician who, because of severe emotional trauma after a missed diagnosis, vows to perfect her diagnostic skills and, as a result, detects subtle evidence of foul play in a surgeon who is declared dead in her ER. When she cannot let go of her suspicions and eventually convinces a private investigator of the possibility of a crime, she begins a relentless quest for suspects and evidence. Now, with angry suspects to deal with, an attempt on her own life, and her struggle with personal demons, she must fight to salvage her self-respect and her professional reputation while pursuing her mission to get at the truth.