A billionaire’s baby was trapped inside a boiling hot car—and the only person who knew was a housekeeper's four-year-old daughter with a plastic stethoscope.

Sophie tucked her red plastic stethoscope back into her apron pocket with the seriousness of a seasoned surgeon. "His chest is warm, but he was lonely. Now he's fine."

Roman looked at the tiny four-year-old girl, then down at his six-month-old son, whose small hand was still tightly wrapped around Sophie’s pinky finger.

The silence that settled over the nursery was heavy, broken only by the hum of the multi-thousand-dollar air filtration system Roman had installed to keep the air sterile. But sterile air couldn't cure the cold vacuum Claire’s death had left in the house.

Rachel stood in the doorway, her knuckles white as she clutched a damp microfiber cloth. Her heart hammered against her ribs like a trapped bird. She knew Roman Bellini’s reputation. Everyone in Charleston knew it. Men who crossed him found their businesses shuttered, their loans called in, or worse, vanished into the shadows of the low-country marshes.

"Please, Mr. Bellini," Rachel pleaded again, stepping into the room. "I'll pack our things immediately. We'll leave."

Roman turned slowly. His tall, broad frame blocked the late afternoon sun streaming through the nursery window. His dark eyes, usually cold and unreadable, fixed on Rachel.

"She called herself a doctor?" Roman asked, his voice low and gravelly.

"It's just a game she plays," Rachel stammered, wrapping her arm around Sophie’s small shoulders to draw her back. "Her father left us last year, and... well, she got the kit for Christmas. She thinks she can fix everything."

Roman didn't answer right away. He reached down—his large, calloused hand hovering hesitatingly above his son’s crib before gently resting on Nico’s stomach. The baby didn't cry. Nico simply blinked up at his father, his dark eyes identical to Roman’s.

"She doesn't leave," Roman said flatly.

Rachel blinked, confused. "What?"

"Your daughter," Roman said, turning back toward the doorway. "She stays. Bring her with you when you work. Keep her near the baby."

"Mr. Bellini, I don't think that's appropriate—"

"I don't care what you think is appropriate, Mrs. Miller," Roman interrupted, his tone leaving zero room for argument. "My son hasn't stopped crying for three hours straight since his morning feeding. Three private nurses couldn't calm him. She did it in thirty seconds."

He paused at the door, glancing back over his shoulder at Sophie, who was currently trying to take Nico’s temperature with a plastic yellow toy.

"Double her mother's pay," Roman called out to Martha, who was hovering nervously in the hallway. "And make sure the girl has whatever she needs."

That was six weeks ago.

In those six weeks, the cold, silent Bellini estate underwent a subtle, terrifying shift. Sophie became a fixture in the nursery. Where high-priced pediatric specialists failed, a four-year-old with a plastic stethoscope succeeded. Nico began to smile. He began to gain weight. He began to make soft, gurgling sounds whenever Sophie dragged her stool over to the crib to give him her daily "checkup."

But while the nursery warmed, the rest of the estate grew increasingly frigid.

Evelyn Whitmore hated the change.

Claire’s sister saw the presence of a maid’s daughter in the Bellini nursery as an insult to her late sister’s memory. More than that, Evelyn saw Roman’s growing attachment to his son as a direct threat to her plans.

For fourteen months, Evelyn had been laying the groundwork to take full custody of Nicholas. She had convinced herself that Roman was an unfit father—a ruthless criminal whose dangerous lifestyle had directly killed her sister. If she gained custody of Nico, she would also gain control of the massive multi-million-dollar trust Claire had left behind for her child.

Which brought them to this blisteringly hot Sunday afternoon in July.

Roman sprinted across the polished marble floor of the foyer, his heavy boots echoing like gunfire. He tore through the rear glass doors and plunged out into the humid, suffocating heat of the Charleston afternoon.

The temperature outside was pushing 102 degrees. The air was so thick with moisture and heat that breathing felt like inhaling hot soup.

Behind him, Charles Vane, the family attorney, strolled out onto the terrace, adjusting his silk tie. "Roman, calm down! The groundskeeper said he's checking. Evelyn took the baby into the garden gazebo twenty minutes ago to read him a story!"

"Evelyn isn't in the garden!" Roman roared, sweeping his gaze across the expansive gravel driveway.

Down near the high brick perimeter wall, where the shade of the grand live oaks didn't reach, parked a silver Mercedes sedan.

The windows were completely rolled up.

The dark tint on the glass made it impossible to see inside, but as Roman drew closer, he saw a faint, desperate movement against the back seat glass. A tiny, wet hand pressing against the window.