When retired nurse Joyce Brannon is discovered brutally murdered, Chicago investigators face one of their toughest challenges yet. There is no forensic evidence, no fingerprints and no murder weapon. The murder appears without motive and it seems that whoever killed Brannon has committed the perfect crime. But when the FBI learns that the victim has been issued with a subpoena to give evidence against a suspected fraudster, they have their suspect. Dr Ronald Mikos is a highly successful Chicago podiatrist who has been under investigation for eighteen months by Chicago's Department of Health and Human Services. This charming and highly successful doctor is the highest earning podiatrist in the state and investigators suspect that he could be swindling the federal government for hundreds of thousands of dollars. But when they attempt to uncover his crimes, they hit a brick wall. Mikos' patients are loyal to their doctor and no-one is prepared to testify against him.