Marie Ferrarella 
Cavanaugh on Duty [EPUB ebook] 

The past never dies…but it can kill Esteban Fernandez has only one reason to live—and that reason vanishes when his cover is blown. As an undercover narcotics detective, Esteban wants to hunt the scum who killed his brother—and put his stepfather in prison for life. Reassigned and rootless, the brooding detective couldn't care less about the sexy cop he's now paired with…until they start finding bodies.Kari Cavanaugh didn't ask for a new partner. Competent and self-contained, Kari makes the best of any situation—by herself. But when a series of murders points toward a serial killer, her scrui y new sidekick may have insights into the case. If only the heat rising between them didn't spark its own danger.