Successful relationships in business, life or online depend on the honesty of all parties. Performing thorough due diligence to discover financial problems, criminal activity and legal action can keep you and your clients in the black and out of litigation. CYNTHIA HETHERINGTON, author of The Guide to Online Due Diligence Investigations, offers "Hetherington’s methods" for performing effective online investigations on people, companies and anyone else you suspect of fraud.