Murder Under the Mistletoe (S02E13)

Phryne and company head to a chalet to celebrate "Christmas in July," but when they get there they find one of the residents dead, electrocuted while hanging festive lights. Two other deaths quickly follow, though not before Jack and Constable Collins arrive on the scene and Phryne begins to figure out which of the chalet's residents might be the next victim. (Prime Video)