The Winner's Circle by Gail Bowen

Joanne's husband, Zack, and his law partners have always been close, working together and spending time at their vacation homes on Lawyers' Bay. But with Zack now the mayor of Regina, and the group still suffering from some recent tragedies, the future of the law firm is unsteady. When a current employee seems to be targeting the lawyers, things become even more uncertain. Will Joanne and her family and friends be able to come out of the situation relatively unscathed? The Winner's Circle is the latest book in this long-running Canadian mystery series.