The first thing Daniel Mercer heard when he stepped through the front door was his daughter crying upstairs.

That night, the Mercer mansion was unnaturally quiet.

Daniel sat in his glass-walled private study on the ground floor, holding an untouched glass of eighteen-year-old single malt scotch. On his desk lay his corporate laptop, its screen glowing softly in the dark room.

Upstairs, the children were asleep—or at least, they were supposed to be. Daniel had insisted on tucking Lily in himself, reading her three stories despite Rachel's subtle protests that he was ruining her bedtime routine. While he was sitting on the edge of Lily's bed, he had noticed something disturbing.

Her bedroom, which used to be filled with bright drawings, stuffed animals, and framed photos of her mother, was stark and sterile. Her closet doors were locked with small brass padlocks. When Daniel asked where her toys were, Lily had whispered, "Stepmom Rachel says big girls don't need clutter. If I keep my room clean for a whole month, I get one toy back."

Daniel had felt a lump form in his throat so large he couldn't speak. He had kissed her forehead, promised her that things were going to change, and waited until she fell asleep.

Now, sitting alone in the dark study, Daniel opened a secure browser window. He typed in the phone number he knew by heart.

The line rang three times before an elderly, raspy voice answered. "Hello?"

"Martha," Daniel said softly. "It's Daniel Mercer."

There was a heavy pause on the other end of the line. Daniel heard the old woman catch her breath, followed by a sharp sigh.

"Mr. Mercer," Martha said, her voice guarded and trembling. "I... I didn't expect to hear from you."

"Martha, I came home early from Chicago today," Daniel said, leaning forward and resting his elbows on his desk. "Rachel told me you quit yesterday over a broken vase. Is that true?"

A bitter laugh escaped Martha's lips over the speaker. "Quit? Mr. Mercer, I didn't quit. She fired me two weeks ago. And she threatened to call the police and accuse me of stealing your late wife's jewelry if I ever stepped foot on your property again."

Daniel's hand tightened around his glass so hard the crystal groaned under the pressure. "Two weeks ago? But Rachel told me you were still working here when I spoke to her on Tuesday!"

"She's been lying to you for months, Mr. Mercer," Martha said, her voice cracking with emotion. "She waited until you were on that three-week European business trip in October to start changing things. First, she let the nanny go. Then she fired the gardener. Then she brought in her own people—her cousin as the house contractor, her friend as the new accountant. She isolated those poor children!"

"Martha... what has she been doing to Lily and Owen?" Daniel asked, his heart hammering against his ribs like a trapped bird.

"She doesn't touch them where it leaves marks, Mr. Mercer—she's too smart for that," Martha whispered frantically. "She locks Lily in the pantry under the stairs for hours if the child so much as spills a drop of milk. She tells that poor little girl that you don't love her anymore, that you only care about your company, and that if Lily complains to you, you'll send her away to a boarding school in Switzerland! And Owen... she leaves that baby in his crib for six hours at a time because she says he needs to 'learn independence'!"

Tears of pure, unadulterated rage welled in Daniel's eyes. He stood up from his desk, his whole body shaking. "Why didn't you call me, Martha? Why didn't you tell me?"

"I tried!" Martha sobbed. "I called your personal cell phone three times! But Rachel had access to your home office router. She blocked my number on your phone! I even tried coming to your corporate headquarters downtown, but her cousin—the new head of building security you hired on her recommendation—had me escorted off the premises!"

Daniel stopped breathing. Her cousin.

Six months ago, Rachel had suggested replacing Mercer Ridge Technologies' long-time security firm with a boutique agency owned by her cousin, Julian Vance. Daniel, trusting his wife and distracted by a massive public offering, had signed off on the contract without looking closely at the details.

"My God," Daniel breathed. "It wasn't just about the kids. She’s systematically cutting me off."

"Mr. Mercer, listen to me," Martha urged, her voice dead serious. "Rachel isn't who you think she is. Claire knew it at the end. Right before Claire passed away in the hospital, she tried to tell you something about Rachel, but you were out in the hallway talking to the doctors. Claire wrote a letter. She hid it inside the wooden music box she left for Lily. Did Lily ever give you that letter?"

"No," Daniel whispered. "Lily never mentioned a letter."

"Find that music box, Mr. Mercer. Find it before Rachel realizes you're looking for it."

The call ended. Daniel stood in the middle of his dark study, the silence of the massive house pressing in on him from all sides. He realized with terrifying clarity that he was sleeping under the same roof as a predator—a woman who had spent four years weaving a net around his family, his fortune, and his life.