Molly heads back to Toronto from the U.K. after learning of her endometriosis diagnosis. Elle has been living at a 'retreat' since having a nervous breakdown. With Rosie and Liv's wedding approaching Elle and Molly will find out if they can handle being in the same room together.

Awkwardness is at an all-time high as Elle and Molly are thrown together to conduct the wedding ceremony after the officiant comes down with food poisoning. Molly's endo pain gets in the way of her desire to hook up with a cute guy at the wedding.