In the middle of a heat wave, Jane and Maura find a man who died suspiciously in a bathtub full of ice. In trying to stay cool, Angela discovers a spicy tea that seems to be working, but it has unexpected romantic consequences.

After Jane jumps from a bridge to save a prosecutor suspected of his murdering his mistress, Maura is terrified that she has lost her best friend. The squad must now renew the search to find the real killer. Meanwhile, Angela enlists Frankie's help as she applies to new jobs.