The Killer Collective

The Killer Collective by Barry Eisler is a thriller.  Livia is the principal character.  She's a detective for the Seattle police force, specifically sex crimes division.  There are hints that she takes vengeance upon the perpetrators of sex crimes because of her past, but her background is never revealed. 
    The plot begins just when she finds a connection to high up federal agencies involved in sex crimes.  Her partner is blown up and she is almost killed.  She seeks help from Dox, who has been waiting in the wings for her.  Dox assembles others to help since the investigation leads to international child pornography. 
     The action is heart thumping.  The dialogue is snappy.  The plot is believable.  And it ends satisfactorily.  The vile are eliminated.  But that's the end of my spoilers.  Good Book.