The Husband's Secret by Liane Moriarty

Ceceila has it all.  A gorgeous husband, three healthy happy girls, a great house.  She is the head of the school parent organization, runs a home business that is thriving and is the queen of organizing.  Her house and life run on a right schedule and everyone envies her and how smooth her life proceeds.

Tess also has her own business.  She started an advertising firm with her husband and her best friend, who is her cousin.  Their talents were complementary and the business is producing quite a good income.  But Tess has just been handed a body blow.  Her husband and cousin have announced that they are so very sorry, they don't know how it happened, but they are in love and want to live together.

Rachel has no issues with relating to body blows.  Years ago her daughter was murdered on her sixteenth birthday.  The murderer has never been found, although Rachel has her suspicions about who might be the culprit.  She works as a secretary at the elementary school and has found solace in her son's new baby, a toddler who loves his grandmother. 

All these women are brought together when one of them opens a letter that should never have been opened.  It contains a secret that wasn't meant to be revealed until after the writer's death.  Now that it has come out in the open, it will affect each of these women and change their lives forever. 

Liane Moriarty has written a novel with three distinct plotlines that comes together in a complex fashion with everything resolved at the end.  Most female readers can relate to at least one of the women and most have known examples of each model.  It leads the reader to speculate on how they would handle such life-altering revelations and what strength they might have to face a crushing disclosure in their own lives.  This book is recommended for mystery readers.