"Translate this, and I'll hand you ten million dollars." Dominic Russo laughed as he slammed a battered leather journal onto the table, convinced no one alive could read it. Seconds later, I quietly read a single sentence from its pages, and every voice in the room disappeared. In that instant, everyone realized the journal wasn't the most dangerous thing in the room—I was.

For the next four days, the penthouse became my command center.

Dominic had transformed the grand library into an advanced linguistic lab. Whiteboards covered in Greek, Latin, Corsican, and Cyrillic symbols lined the oak walls. High-speed military servers hummed in the corner, running frequency-analysis algorithms I designed myself.

I barely slept. I lived on black coffee, cold sandwiches brought by silent servants, and the intoxicating thrill of breaking a code that had remained dark for fifty years.

Dominic was rarely absent. He worked at his own massive desk on the opposite side of the library, conducting quiet, terrifying phone calls in fluent Italian, Russian, and French, managing an empire that spanned three continents.

Yet, every time I looked up from my work, I found his gray eyes fixed on me.

He watched me with an intensity that wasn't just about the code. He watched the way I chewed on my pencil when I was frustrated, the way my hair fell out of its messy bun, the way my eyes lit up whenever I cracked a complex grammatical knot.

On the fifth night, at two o'clock in the morning, I finally broke the third ledger.

"Oh my God," I gasped, dropping my red pen onto the glass desk.

Dominic was instantly on his feet. In three long strides, he crossed the library, standing behind my chair, leaning over my shoulder to look at my handwritten translation.

"What is it?" he asked, his voice low and close.

"The Vanguard isn't trying to steal your shipping routes, Dominic," I breathed, my fingers trembling as I pointed to the translated text. "They're hunting for an artifact. Something called The Tsar’s Lexicon."

Dominic’s posture went rigidly still. "The Lexicon?"

"You know what it is?" I asked, turning my head to look at him. Our faces were inches apart. I could see the flecks of gold in his dark gray irises, the subtle line of a scar near his left eyebrow.

"It’s an urban legend," Dominic said quietly, his eyes narrowing. "A 16th-century cipher book created by Ivan the Terrible's personal alchemists. It’s supposed to contain the master key to every diplomatic cipher used in Eastern Europe for three hundred years. My grandfather spent twenty years looking for it and concluded it was destroyed during the Bolshevik Revolution."

"It wasn't destroyed," I revealed, turning back to the ledger. "Look at page eighty-eight. Constantine’s predecessors didn't destroy it—they buried it in a private vault beneath St. Patrick’s Old Cathedral in Manhattan. And according to this... the Vanguard already has two of the three keys required to open the vault."

Dominic leaned lower, his chest pressing lightly against my back, his hand resting on the back of my chair. The sheer physical presence of him sent a wave of heat rushing through my blood.

"And where is the third key, Maya?" Dominic whispered near my ear.

I swallowed hard, reading the final translated line of the Corsican shorthand. My heart dropped into my stomach.

"The third key," I whispered, turning my head to look at him, "was sold at an estate auction in London thirty years ago... to Dr. Julian Linwood."

Dominic froze.

"My father," I choked out, tears suddenly prickling my eyes as the terrifying truth dawned on me. "My father didn't get blacklisted from Columbia because of forged Byzantine tablets. He got blacklisted because he possessed the third key to the Tsar’s Lexicon. They destroyed his career... they drove him into poverty... and they let him die in debt while hunting for it!"

Dominic’s jaw set into stone. The cold, lethal killer reappeared in his eyes, but this time, it was laced with a fiery, protective rage.

He reached down, taking my hand in his, pulling me up from the chair until I was standing flush against his chest.

"They used your father, Maya," Dominic said, his voice ringing with absolute, terrifying conviction. "They broke his life and left you to pick up the pieces. But they didn't know he left his greatest weapon behind."

"Me," I breathed.

"You," Dominic confirmed, his thumb gently wiping away a tear that had escaped down my cheek. "We go to St. Patrick’s Cathedral tomorrow night. We take the Lexicon before the Vanguard even knows we’re there. And then... we burn their empire to the ground."

I looked into his eyes, no longer seeing a terrifying crime boss, but a man who was offering me the one thing I had longed for since my father died: justice.