The Brokenwood Mysteries S08E06 - Four Fires and a Funeral

The charred remains of a body are discovered in the burned-out remnants of a rural shed, but no one lived there, and no one was meant to be there at all. As Mike and Kristin are tasked with identifying the unidentifiable, it becomes apparent this is the third in a run of "accidental" deaths, all attended by the Brokenwood Fire Brigade. Could one of its members be Brokenwood's first serial killer?