I am Sarah Peterson, 32 years old, and I have been married to Mark Peterson for seven years. We used to be the model couple in this quiet suburb—a rock-solid marriage built on trust and a jointly held real estate contract. But that solid foundation had begun to crack because of Mark, and the person who helped destroy it was Jessica Miller, my best friend of ten years, who also happened to be Mark’s executive assistant at the law firm.

First, it was the secretive Zalo messages at 11 p.m. Then came the nights Mark claimed he had to stay late at the office to finalize legal documents, while his phone kept buzzing with notifications from a travel app. Jessica frequently posted check-in photos at high-end bars, but I always caught a faint reflection of a familiar striped tie on the counter behind her. I observed it all, silently, like a patient predator.

The breaking point arrived one Friday evening when Mark seriously announced he needed to go on a five-day business trip to San Diego to negotiate a massive merger deal. I smiled, nodded, and even added his favorite air freshener to his suitcase. Exactly two in the morning the next day, Jessica posted a brief status: “Time to step away from the numbers and enjoy the Cali sunshine,” along with a photo of her flight ticket and the burgundy suitcase she used for documents.

I didn’t bother checking the security camera feed anymore. I just sent a single command to the GPS system in Mark’s car: “Report location 24/7.” And for five days, the car remained stationary in the parking lot of a luxury resort in San Diego.

On the fifth night, Mark walked into the house at 11 p.m. He looked tired from the late flight, but a strange sense of satisfaction flickered across his face. He kissed my hair and whispered, “I missed your scent.”

I replied, my voice flat, “Are you sure about that, Mark?”

He paused, sensing the oddity, but quickly dismissed it. After showering, he sat down at the kitchen counter where I had prepared his favorite steak and red wine.

I watched him cut the meat, raise the glass—everything was familiar, yet the man was a stranger.

Just as he set his fork down, I asked him:

“Mark, do you know what disease she has?”

His fingers tightened. The silver fork clattered onto the porcelain plate with a sharp sound.

“Wh-what? Sarah, who are you talking about?” he stammered, his face instantly turning pale.

I took a sip of wine and calmly met his gaze.

“Jessica. Your assistant. What is she sick with, Mark? You were with her for five days, don’t you know?”

Mark shot up, knocking the chair backward. He was ashen, his eyes filled with panic.

“What’s wrong with her? Sarah, tell me! What disease does she have?” He grabbed my arm, his voice trembling, desperately seeking the truth.

I didn’t answer that question. I simply pointed to a file folder placed on the kitchen shelf.

“Her illness is not as important as the one our company is suffering from, Mark,” I said. “During the five days you and she were in San Diego, I didn’t call the police about the affair. I called the Group’s Financial Inspectorate Board. Do you remember transferring $3.2 million to a personal account in the Cayman Islands last year, a transaction you thought only Jessica knew about? That’s called embezzlement, Mark. And it was discovered exactly 36 hours after you took off.”

Mark stared at me, unblinking, all color drained from his face.

“Jessica tracked every single one of your transfers. She was your assistant, but she was working for me. The bar check-in photos, the secretive texts… they were all bait to distract me from the truth about the company’s finances.”

I stood up and walked toward the door.

“Don’t worry about her physical illness. Worry about your prison sentence and the fact that I will get 100% of this joint property. The only illness Jessica has is crippling debt, and she agreed to pay that debt by helping me set you up.”

“That trip to San Diego wasn’t a business trip, Mark. It was the going-away present I gave you both before I triggered the investigation file. Have fun with your striped tie and the FBI indictment.”

I stepped out the door, locking it from the outside, leaving Mark alone in the luxurious kitchen, his eyes hollowly fixed on the embezzlement file, not the file of betrayal.