All physicians are taught, “First do no harm.” But what happens when a doctor does harm his patients? Dr. Robert Henderson was a veteran spinal surgeon in Dallas when he got an unusual phone call from a local hospital: a new surgeon had operated so poorly that a patient who’d walked in on her own two feet now couldn’t even wiggle her toes. Dr. Henderson had seen a lot, but he wasn't prepared for this. The surgery was so bad, in fact, he asked himself whether this person possibly be an impostor impersonating a physician?