It is number 13 in the Harry Bosh series which contains 16 novels. At the observatory in the Hollywood Hills a corpse is found. Harry - who is 56 years old - takes over the investigation with his new partner Ignacio Ferres. They discover that the victim is Stanley Key, who worked in the clinical sector and had access to radioactive substances, such as cesium.
From a simple homicide, the case becomes an event related to terrorism and the FBI wants to take the lead to find the culprits. The person in charge is Rachel Walling, from the Tactical Intelligence Department, who had been having an affair with Bosh and makes things difficult for him. Harry continues to act on his own and realizes that nothing is what it seems. The ending is astonishingly unexpected.
It is a fast-paced, entertaining, funny and quick read. All the action takes place in 12 hours thanks to the genius of Harry Bosh who solves the complicated crime in a very fast way. The competition between the feds and the local police is part of the interesting part of the plot. The American author is one of the most successful thriller writers in the world, his books are best sellers. More than 30 of his novels have been published.