Shannon Staub Book Club

This month we will be reading and discussing "The Husband's Secret" by Liane Moriarty. Cecilia Fitzpatrick thinks she knows her husband inside out, so she's surprised to accidentally discover a dusty sealed envelope in the attic with "For my wife - to be opened only in the event of my death" written on it in his handwriting. When she casually mentions it to him on the phone, his reaction makes it clear that the last thing he wants is for her to open that envelope - but why?