Bad Blood — Suzanne Proulx

GOOD SEX. BIG MONEY. BAD BLOOD . . .
A successful risk manager who loves living life on the edge, Victoria Lucci (pronounced "lucky") wears Norma Kamali, dates too many married men, and strives to keep her Denver hospital out of the headlines. But her job is about to take an unlucky turn: Patients are winding up dead, and it looks like someone in the hospital is responsible. . . .
Four people have been given tainted blood. Vicki has suspects, leads, evidence, even the cops on her side. The trouble is, she can't help taking matters into her own hands. And when the matter is murder, that means she runs the greatest risk of all: losing her life.

"From the Paperback edition."