Status Updates From Highlander's Forbidden Lass

I loved the book. Ian pretends to be Fynn from her mother's clan, but really is the Lairds son of the warring can next to them on their borders. When Maddie finds out she hates him. Ian sneaks over to her property and explains himself and she excepts him. Trouble follows as someone in his family is trying to take over her clan. Ian's father ,brother her father ,and some cousins are killed.Who killed them at a summet?