The laboratory grew so quiet that the faint, high-pitched whine of the cooling fans inside the unshielded testing rigs sounded like a dentist’s drill against bone.

That evening, the city lights of Seattle began to twinkle against the gathering dusk as Dean walked through the automatic sliding doors of Harbor Crest Medical Center.

He didn't need to visit room 412 tonight.

Instead, he walked down the corridor to the pediatric recovery wing, stopping outside Room 418. Through the glass window, he watched through a wide, relieved smile.

Emma Miller sat upright in her hospital bed, her color completely restored, laughing as a nurse helped her peel off a sheet of shiny silver star stickers. The dark circles under her eyes were gone, replaced by the bright, energetic glow of a healthy eight-year-old girl whose heart was beating with strong, steady rhythm.

Dr. Sarah Vance stepped out into the hallway, pulling off her surgical cap and smiling warmly as she saw Dean approach.

"Vitals are pristine, Mr. Miller," Dr. Vance reported, checking her clipboard. "The repair healed cleanly. If she keeps recovering at this pace, we'll be discharging her home by this weekend."

Dean let out a long, shuddering breath, feeling the last remaining ghost of fear leave his shoulders. "Thank you, Doctor. For everything."

"Don't thank me," Dr. Vance said, patting his arm gently. "Thank yourself for refusing to give up."

As the door opened, Emma looked up and spotted him.

"Dad!" she cheered, scrambling to unlatch the blanket from her legs.

Dean hurried across the room, catching her in a tight, protective embrace, burying his face in her soft hair as a single tear of pure, unadulterated joy escaped his eye.

"Hey there, peanut," Dean whispered, his voice thick with emotion. "How’s your heart feeling?"