(By Andrew Dys and Christy Mullins, Rock Hill Herald) A $3.7 million scam, 20 years in the making. Dozens of society's most vulnerable victims.An avalanche of federal, state and private investigations. Indictments that could land a Rock Hill man in prison for the rest of his life.None of it would have come to light were it not for a 70-something great-grandmother who smelled a rat.We don't know her name.