In Jane Green's delicious novel, the Other Woman is th mother-in-law. Ellie thinks she's found the perfect man in Dan, and she loves being accapted as part of his close-knit family. Until she begins to realize that Dan's mom, Linda, is a little too involved. Dan and Ellie's intimate civil wedding ceremony gets transformed into a black-tie affair, Ellie begins to wonder if it's possible to marry the man whitout marrying his mother.