Heat — Campbell Armstrong

While pursuing a seductive female terrorist, Detective Frank Pagan crosses the line between duty and sexual obsession in international bestselling author Campbell Armstrong's spellbinding thriller.

It's a name that makes counterterrorism agents' blood run cold because it is attached to hundreds of deaths -- murders by hand, by bomb, by knife. Carlotta. She haunts Frank Pagan's dreams and seems to taunt him at every turn.
 
Despite following every lead, the renegade detective can't catch the female terrorist he needs to thwart and bring to justice. As their cat-and-mouse game heats up, Frank can't admit to anyone but himself that he finds the woman fascinating -- and that she seems to  be equally attracted to him.
 
With his final Frank Pagan novel, Campbell Armstrong delivers an incendiary psychological thriller.

Heat is the 5th book in the Frank Pagan Novels, but you may enjoy reading the series in any order.