A Letter to Three Wives (1985)

Three women are going on a trip that leaves incommunicado with the rest of the world and before they leave; a woman who either has a history or relationship with each of their husbands leaves them a letter that says that she is leaving with one of their husbands. As they wait to return so they could find out who it is, they each remember an important moment in their lives that involves them and their husbands...and the woman.