Chapter 4 - The Numeric Trap

The digital display on the hallway keypad pulsed with an rhythmic, emerald glow, casting an eerie hue across Lily’s face. The numbers flashing on the screen—4-8-12-0-9—seemed to mock the suffocating silence of the hallway.
"Type it in, Lily," Clara urged softly, her green dress rustling as she crept closer, her phone still raised to record every second of the unfolding disaster.
"Don't you dare touch that," Helen hissed, wrenching her arm out of Marcus’s grip and lunging down the hallway. Her face was flushed, the veneer of calm completely shattered. "Marcus, stop her! She’s a child! She doesn't know what’s locked in that vault!"
"Vault?" Marcus repeated, the word tasting like ash in his mouth. He stared at his sister, his gaze sharp and accusatory. "What vault, Helen? This is a suburban tract house. There are no vaults here."
"Not in the blueprints," Clara interjected, her eyes gleaming with vindictive triumph. "Unless you remodeled the basement right after your sister-in-law mysteriously vanished without a single forwarding address."
Helen slammed her hand against the wall beside the keypad, blocking Lily’s small frame with her body. Her chest heaved beneath the satin blouse.
"You have no idea what she was doing behind our backs," Helen spat, her voice cracking with suppressed hysteria. "The money missing from the accounts, the late-night visitors, the forged signatures! I protected this family! I protected Marcus!"
"By locking her away?" Lily’s voice cut through the shouting like broken glass. The eight-year-old didn't back down. She stared straight up into Helen’s terrified eyes. "Mom called me from the basement last night. She said the frosting was the only way to send the code."
Helen’s breath hitched. She stumbled back as if she had been physically struck, her hands flying to her mouth.
"She... she lied," Helen whispered, staring wildly at Marcus. "Marcus, she’s manipulating the girl. You know how imaginative Lily is. It’s a trick!"
Marcus slowly shook his head. He reached out, his long fingers gently resting on his daughter’s shoulder, pulling her safely behind him. He stepped up to Helen, towering over her in his navy suit, his face carved from stone.
"If she’s lying, Helen, then opening this keypad will prove it," Marcus said quietly. He reached down, picked up the silver key from where it had rolled near the baseboard, and slid it into the manual override slot beneath the digital screen.
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The lock turned with a heavy, satisfying clunk, and the wall panel hissed as a hidden door swung inward, revealing a pitch-black staircase descending into the earth.
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