What is the main conflict in The Concrete Blonde by Michael Connelly?

The Concrete Blonde by Michael Connelly is an exciting and fast-paced drama about Harry Bosch - a Los Angeles police detective, who at the age of forty three is in court defending himself against the widow of a man he was forced to shoot. When he attempted to arrest the man he believes to be the Dollmaker killer, despite warnings, the man reached under his pillow .