The Assassin — Tara Moss

In this “fantastic end to a truly thrilling series,” a female PI with a price on her head turns vigilante in the name of taking down a crime family (Woman's Day).
 
When Makedde Vanderwall disappeared in Paris, everyone, including her federal agent ex-lover and her former cop father, presumes she's dead. Everyone, except the Cavanaugh clan, one of the richest and most ruthless families in Australia. With a price on her head and a perilous need for revenge, Mak wants to put an end to the family's senseless violence against the innocent. With her body honed and her mind as sharp as a knife, Mak emerges from her isolation a woman transformed, an assassin ready, willing, and able to find justice once and for all. 
 
At first, Mak doesn't plan on seeing Andy again. But turns out he's the only man she can trust. He's also the man she still loves. But Mak's survival means putting all feelings aside. If she can. . . .
 
“Makedde Vanderwall ranks up there as [a] contemporary Aussie literary icon.” -- The Daily Telegraph
 
“Mak is the female equivalent of Jack Reacher.” -- Joanne Harris, New York Times�"bestselling author of Chocolat