Aryan Khan and his younger brother, Vihaan, are the ruthless rulers of both the legal and illegal worlds-men of immense power and influence, feared by enemies and revered by allies. Yet, despite their iron grip on everything around them, their hearts are captive to the only people who could ever bring them to their knees: their wives, Avani and Aavya Malhotra. The Malhotra sisters, innocent and sensitive, carry the weight of a haunting past. But even their darkest secrets pale in comparison to the violent and merciless world Aryan and Vihaan have clawed their way through. Especially Aryan, whose history is drenched in betrayal, blood, and loss-a life far more sinister than anyone could imagine. As the past begins to resurface, threatening everything they hold dear, the brothers must protect their delicate love while keeping their savage world at bay. But in the shadows, old enemies lurk, and the truth of Aryan's brutal legacy could tear their lives apart. In "Sinister Heir", loyalty is tested, love is weaponised, and the past never stays buried for long.