Hades (Archer and Bennett 1) by Candice Fox
Twenty years ago, two children were kidnapped and left for dead . . .
Homicide detective Frank Bennett has a new partner--dark, beautiful, coldly efficient Eden Archer. Frank doesn't know what to make of her, or her brother Eric, who's also on the police force. Their methods are . . . unusual. But when a graveyard full of large steel toolboxes filled with body parts is found at the bottom of Sydney harbor, unusual is the least of their worries.
For Eden and Eric, the case holds chilling links to a scarred childhood--and the murderer who raised them. For Frank, each clue brings him closer to something he's not sure he wants to face. But true evil goes beyond the bloody handiwork of a serial killer--and no one is truly innocent.