In the glittering, cutthroat world of Eden City, where power is inherited and love is a calculated risk, Sofia Vanguard and Ethan Reagan are forced into a marriage that neither of them wanted. Sofia Vanguard, a successful cardiologist and heir to the vanguard's medical empire was stuck in the dirty game of the Reagan family leading to a scandal that left her married to Ethan Reagan, a man she didn't love. The death of her elder brother Nathan,had left a void in her heart mainly because of the uncertain nature of his death. Ethan Reagan,on the other hand was the youngest son of the Reagan family and the favourite of his father which made him the potential heir but this brought many challenges and threats from enemies within the family. Ethan was not the only one with eyes on the empire. With the forced marriage Sofia is stuck in the tug of war and power that Ethan was already involved in from birth. Would Ethan be able to survive the threats and challenges he faced from within and outside his family? Would Sofia life be in grave danger now that she has a connection to the Reagan family? The Heiress and the Billionaire Vow is a tale of love, power, and redemption, set in a city where ambition rules, and nothing is as it seems