The Bridesmaid by Cate Quinn (Author)

When a celebrity bridesmaid is murdered weeks before an exclusive society wedding, forensic attorney Holly Stone is drafted as an unlikely undercover replacement. As she works to unpick the lives of the notoriously private Kensington family, glamour-averse Holly discovers a new worst enemy in bridezilla Adrianna. Heir to a multimillion dollar fortune, Adrianna is set on throwing the event of the decade, and she won't let anything get in her way.