The oath - John Lescroart

Doctor Eric Kensing is living in fear that he is about to be indicted for the death of a patient. That patient was his boss, Tim Markham. But Kensing and Markham aren't just connected by work - Kensing's wife is one of Markham's many lovers. It's not looking good for Kensing, so he enlists the help of lawyer Dismas Hardy. Some say Kensing is not worth saving, although others say that Kensing is a special doctor, prepared to do anything to save a patient's life, even defying proper medical procedure. Despite all the damning evidence, Hardy becomes increasingly sure that Kensing is innocent. Against mounting pressure for an arrest, Hardy knows that the only way to save Kensing is to find the real murderer. And like Kensing, he seems to be working within a system that is set up to thwart him and any attempt at real justice...