I never told my mother-in-law that I was the country’s top heart surgeon. She told everyone I was a “hospital cleaner” and refused to let me touch her food, saying I was “full of germs.” Then, she collapsed at a family dinner from a massive cardiac arrest. The ambulance rushed her to my hospital. The ER doctor yelled, “We need the Chief of Surgery, now! It’s a complex case!” My mother-in-law opened her eyes groggily to see me scrubbing in, scalpel in hand. “You?” she gasped. “Yes,” I said calmly. “And your life is literally in my hands.”

The smell of a human heart being sawed open is distinct. It is the smell of burning bone dust, metallic blood, and the ozone tang of the cauterizer. To most, it is the scent of nightmares. To me, it is the perfume of salvation.

I stood over the open chest cavity in OR 4 at St. Jude’s Hospital, my hands steady inside a ribcage, holding the rhythmic, beating center of a stranger’s life. I was Dr. Evelyn Vance, the Chief of Cardiothoracic Surgery. In this room, under the harsh halo of the surgical lights, I was a god. My word was law. The nurses anticipated my needs before I spoke them; the residents watched my suture technique with the reverence of acolytes studying a scripture.

“Clamp,” I said, my voice low and even.

“Clamp,” the scrub nurse repeated instantly, slapping the steel into my palm.