I canceled my ex-mother-in-law’s credit card the moment the divorce was finalized—and when my ex called, furious, I finally said everything I had kept bottled up for years. “She’s your mother, not mine. If she still wants quilted Chanel bags from Fifth Avenue, figure out how to pay for them yourself.”

Someone was actively attempting to beat my reinforced oak door off its hinges. Then, a shrill, hysterical voice echoed through the hallway, saturated with pure, unadulterated venom. “Open this door, Marissa! Right this instant! No ungrateful, arrogant wretch humiliates me in public and gets away with it!” The air in my bedroom turned freezing. It was Eleanor. And in that horrifying moment, I realized the chilling truth: cutting off the money wasn’t the end of the war. It was just the opening shot… The violent pounding continued, an unrelenting, frantic rhythm that echoed like gunshots down the usually pristine, silent corridors of the Tribeca building. I didn’t scramble out of bed in a panic. I didn’t scramble for my phone to dial building security. Instead, a strange, sub-zero calmness washed over my entire nervous system. It was the specific, terrifying tranquility that arrives when you realize you have been backed into a corner, and the only remaining exit requires you to burn the building down. I threw off the duvet, my bare feet hitting the cold hardwood floor. I didn’t bother reaching for a robe to cover my silk pajamas. I walked with slow, deliberate steps down the hallway toward the foyer. “I know you are in there, Marissa! Open the door!” Eleanor’s voice had pitched into a shrill, manic screech, completely devoid of the faux-aristocratic restraint she normally projected. I reached the front door and silently pressed my eye against the brass peephole. The fisheye lens distorted the hallway, but the image was agonizingly clear.