Michelle Pfeiffer, Treat Williams and Whoopi Goldberg star in this adaptation    of Jacquelyn Mitchard's best-seller about a woman who has to rebuild her life    and family when her son's disappearance tears them apart.  From director Ulu     Grosbard (Georgia, Straight Time). "Pfeiffer is a treasure"        (Richard Corliss, Time).                                                 Ulu Grosbard---USA---1999---109 mins.