Take Out by Felicity Young.
Felicity Young is an Australian crime writer, and I'm always keen to introduce myself to new authors from across the ditch. This is her third DSS Stevie Hooper novel.
Here's the back cover blurb...
YOU TAKE MY GIRLS AND I TAKE YOU: SKIN FOR SKIN
A deserted house. The remains of an unfinished meal. an unexpected find. And a routine police investigation going nowhere.
When Detective Senior Sergeant Stevie Hooper of the Sex Crimes unit steps into the empty Pavel house and someone else's jurisdiction, she upsets more than the ego of a struggling suburban cop. She has breached the defences of a world that has its rotten heart a ruthless disregard for human life.
Her own family in crisis, a case like this is the last thing Hooper needs. And she is about to discover that those who cross the Mamsan do so at their peril.