On his Saturday-morning radio show, Daryl Bank advises listeners on retirement investments and avoiding scams. He and his firm, Dominion Investment Group, target retirees like Charlotte Annas and her husband, Pat, who decide to invest their hard-earned retirement savings, and Richard Fairchild, who is working and wants to save more for his daughter’s college tuition. But when federal and state investigators start looking into the company, it’s clear that that trust has been broken.