Eighteen months ago, the new buyers of Forest Park Hospital vowed to revive the beleaguered institution. They voiced optimism that the once-thriving, 450-bed medical center could be saved by fresh capital and determined leadership. They seemed equally enthusiastic about their other acquisition — St. Alexius Hospital in south St. Louis. Even the name of their company — Success Healthcare LLC — evoked the sense that better days were ahead. But the three partners from South Florida were ill-prepared to make good on their words. In reality, they were already deep in a financial scandal that involved the potential loss of more than $500 million in investor funds, the suicide of an investment manager in Bermuda, and allegations of fraud and self-dealing.