The Overlook by Michael Connelly
A Harry Bosch Novel
Harry gets called out to a murder scene on the Overlook in the Hollywood Hills. He begins working the homocide case as he would any other, but things quickly turn chaotic when the case gets taken over by the FBI and then turns into a Homeland Security nightmare when it is discovered that a large batch of cessium is missing and possibly in the hands of a well-known and wanted terrorist.
I always enjoy a Harry Bosch novel.