A billionaire had already spent more than $3 million trying to save his mysteriously weakening twin sons when his private doctor laughed at me for thinking a nanny might notice what specialists had missed. Hours later, I found something hidden in plain sight outside the boys’ bedrooms, and the terrified look on a housekeeper’s face told me their illness might not have been a mystery at all.

The two contractors didn't hesitate. They were paid mercenaries, not estate guards, and Blake’s word was their check. Both men reached for their holstered sidearms, stepping forward to clear their lines of fire.

Before their weapons could clear leather, a deafening crack shattered the morning air.

The driver-side window of the Mercedes exploded into a thousand glittering pebbles.

One of the contractors cried out, clutching a shattered shoulder as he was knocked backward onto the gravel. The second guard froze, his hand hovering over his holster, his eyes darting toward the second-story balcony of the main house.

Standing on the stone balustrade, leaning heavily against the carved pillar for support, was Vincent Moretti.

In his hands was an antique Holland & Holland double-barreled hunting shotgun, smoke still curling lazily from the right barrel. His face was gray as slate, his dressing gown soaked through with rain, his body trembling with the monumental effort it took to stay upright. But his eyes were no longer clouded. They were burning with the lethal, cold fury of a man who had just realized that the devil had been sleeping in his house.

"Step away from my children, Harrison," Vincent said, his voice echoing across the courtyard with the force of an oncoming tide.

Blake didn't move. He stood frozen on the ambulance step, calculating his odds. "Vincent, you're experiencing a toxic psychosis. Lower the weapon. I am trying to save your sons."

"I broke the locks on the master study, Harrison," Vincent said, racking the second barrel into place with a mechanical snap that sounded like thunder. "Mrs. Harper brought me the duplicate files from your carriage house. I saw the Delacroix trust dissolution protocols. I saw the transfer orders."

Blake’s face twisted, the mask of the refined, elite physician peeling away to reveal the feral creature underneath. He reached into his coat pocket, pulling a small, pressurized metal syringe from his lapel. He turned toward the interior of the ambulance, raising the needle toward Leo’s exposed neck.

"If I don't leave this estate with those children," Blake snarled, "neither of them lives to see the sunset!"

He never had the chance to plunge the needle.

I launched myself across the gravel.

I didn't try to tackle him; I threw my entire weight into the heavy steel rear door of the ambulance, slamming it inward with all the force my legs could generate.

The door struck Blake’s extended arm with a sickening, wet crunch.

The doctor shrieked in agony as his forearm snapped between the steel frame and the chassis. The syringe flew from his fingers, clattering uselessly against the asphalt and shattering under the rear tire.

Blake fell backward onto the gravel, clutching his broken arm to his chest, writhing in the mud.

The remaining contractor raised his hands above his head, backing slowly away from the vehicle and dropping his weapon onto the driveway.

I scrambled into the back of the ambulance, tearing the toxic oxygen mask from Leo’s face. I pulled the child into my lap, pressing my cheek against his cold forehead. His pulse was weak, fluttering like a trapped moth, but he was breathing clean, unadulterated sea air. Lucas reached out from the adjacent gurney, his tiny, trembling fingers locking around the fabric of my torn sweater.

"Claire..." Lucas whimpered, tears cutting clean lines through the grime on his cheeks. "Are we going to be okay?"