​Allegra, my identical twin, was brought back to our family home in a body bag.​Across the room sat Matteo Caldwell. He lounged in the armchair as though her death were a minor inconvenience, not a single trace of remorse in his cold, dark eyes. All that mattered to him was protecting his immaculate image as the untouchable CEO of the Caldwell Group.​They had pushed her to her absolute limit. The Caldwell family needed an heir, and they hadn't cared that her health was rapidly deteriorating under the brutal physical toll of the pregnancy. She was only four months along. Four months. Her fragile body simply couldn't take it, and her heart gave up.​It was only at the eleventh hour that I discovered the truth: the ancient blood debt our family owed the Caldwells. That was why Allegra had signed that fatal contract—to trade an heir for our freedom. She had always been the physically weaker twin, but her towering ambitions had blinded her. My sister had dreamed of becoming the wife of a billionaire, the matriarch of a dynasty. Instead, that dream was violently snatched away by the very man she had died trying to please.​"Your family must repay their debts," Matteo demanded, his voice dropping like an axe in the silent, mourning room. "Allegra failed to deliver what she signed for. Either your mother takes her place and gives me an heir... or you will."​If a Caldwell wanted something, they took it. No exceptions.​Trapped with no other choice, I stepped into the line of fire. I signed the marriage contract with Matteo. The primary conditions? Bore him an heir, repay the debt, and survive.​The world remained completely clueless that Allegra was gone. Her burial was conducted in the dead of night, a secret kept to preserve the pristine reputation of the Caldwell empire. I stepped into her shoes. I took over her life. I became her.​They killed my sister, acting as though they owned every breath we took. But Matteo Caldwell has no idea what he just invited into his bed.​I am not Allegra.​And before I am through with them, they will find out exactly what it feels like to burn.