Ep 3. Death Down Market

When Faith Pecci is found bludgeoned to death and hanging upside down in the living room of her house, it's the local gang who are immediately blamed. The victim's sister Rose however believes her sister's ex-husband is the killer Tessa and Steve are searching for. Who did kill Faith Pecci? Was it a gang or the ex-husband? Or is the killer far more devious than either of these?