John Lescroart. The Oath (2002) 408 pp.
In San Francisco, Parnassus Medical Group CEO Tim Markham is a victim of a hit and run accident. Tim dies in his companyís Portola Hospital, but the autopsy reveals that his injuries did not kill him. Instead Tim died from an overdose of potassium. San Francisco homicide detective Abe Glitsky believes that the doctor of record Eric Kensing killed his boss because Tim was having an affair with the prime suspectís wife and the HMOís cost-cutting measures threatened the lives of his patients. Attorney Dismas Hardy thinks someone else is the killer. Soon evidence surfaces that a serial killer has made the CEO victim number twelve. Now the two best friends, Dismas and Abe, work on uncovering the identity of a murderer before the toll reaches a bakerís dozen.