Cece is in love. She has arrived early at her in-laws’ beautiful lake house in Salish, Montana, to finish planning her wedding to Charlie, a cardiac anaesthesiologist with a brilliant future. When Charlie asks Garrett, his best friend from college, to officiate, Cece can’t imagine anyone less appropriate for the task. Garrett doesn’t believe in love, much less marriage. But as she spends time with him and his gruff mask slips, her long-held expectations for her life with Charlie begin to crumble, leading to an impulsive decision that will alter the three friends’ lives forever, the events of that July reverberating through marriage, parenthood and across generations.