It's Delia's (Necar Zadegan) wedding day! After betraying Delia and revealing her affair to the girlfriends, Abby (Lisa Edelstein) has been uninvited to the big day. With her deadline looming, Abby focuses her energies on finishing her book "Girlfriends' Guide to Divorce." Barbara (Retta) discovers that Abby is starting to unravel and rallies the girlfriends to help. In a scramble to get Abby to mend things with Delia, no one sees the big surprise that is revealed at the wedding.