In the summer of 1952, Lillian Johnson was found dead in her home, slumped in the wheelchair that had become her cage due to multiple sclerosis. An overdose of barbiturate had triggered a heart attack, but the scene was not quite right. It looked as though someone other than Lillian herself had injected the fatal dose. Dr. Kate Marlow, Lillian's physician and best friend, now sits in the Round Rock city jail. The only country doctor for miles,...