Chapter 4 - The Vault Opens

With a heavy pneumatic hiss, the reinforced steel door beneath the floor popped open, releasing a rush of stale, trapped air.
"Ethan! Grab my hand!" Emma yelled, ignoring the terrifying sight of the leveled firearm pointing directly at her.
From the dark cavity, a tiny, trembling hand reached upward. Emma grabbed his wrist with all her might, hauling the exhausted, terrified nine-year-old boy out of the freezing hole just as a deafening, muffled thud echoed through the sub-basement.
A bullet chipped the concrete wall inches from Emma’s ear, sending a shower of sharp stone dust into her face.
"Stay down!" Emma screamed, pulling Ethan behind a thick cast-iron support pillar as a second shot ricocheted off the pipes overhead.
Isabella marched down the final steps, her face twisted in absolute fury. The mask of the elegant billionaire's bride was completely gone, replaced by a cold-blooded killer. "You absolute fool, Emma! You think you can ruin everything I’ve built? William is worth billions, and this entire estate will belong to me once the boy has a tragic 'accident' and the maid vanishes without a trace!"
"Daddy!" Ethan sobbed, clutching Emma's uniform sleeve so tightly his knuckles turned white. "Daddy, help us!"
"Your daddy is upstairs drinking champagne, listening to jazz, completely oblivious to the fact that his new wife is a psychopath," Isabella sneered, stepping closer, her pistol raised and aimed straight at Emma’s chest. "Any last words, maid?"
Emma’s mind raced. She couldn't fight a trained killer with brute force. But her eyes caught the heavy industrial steam valve attached to the massive pipe running directly above Isabella’s head. The pressure gauge was vibrating dangerously in the red zone.
"Look behind you," Emma said calmly, pointing past Isabella's shoulder.
Isabella didn't fall for the trick completely, but her eyes flicked sideways for a split second—just enough time for Emma to grab a heavy wrench lying on the maintenance table and hurl it with every ounce of strength she possessed.
The wrench struck the rusted brass wheel of the steam valve with a loud, metallic clang, spinning it open three full rotations.
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PSSSSSSSHHHHHHH!
A massive plume of scalding white steam erupted from the high-pressure pipes, enveloping Isabella in a blinding, roaring cloud of heat and vapor.