Deadly Patterns — Bonnie Edwards

This is the third book in the DP series. Deadly Payback, Deadly Pairs and now Deadly Patterns.
In Tucson, Detective John Hoffman known as “Tec” and his partner Bill Jenkins have added one new detective to their team. Frank Alvarez was useful in finding a pair of serial killers which made both Bill and Tec seek to add him to their team. Now the three of them face new challenges, a trio of golfer's lying dead on the third tee of a local golf course, tunnels that appear from seemingly nowhere and run underground revealing yet another body and, in the Tucson foothills, a kidnapping and an explosion leaving behind a gruesome scene. Even with occasional input from Sara Hoffman, this week of crime and destruction brings pressure to bear on the team to find those responsible and quickly too. Working independently, they keep one another up to date until one crime crosses the path of another and their separate inquiries meet, bringing them to some terrifying conclusions. Frank Alvarez embarks on a path he might soon regret. And Julie, well Julie is still out there, still evading the police, though her good times may soon be over whether or not the authorities find her.