Lesser Angels: Finding What You Didn't Know Was Lost

How Well Do You Know Your Parents?
While going through their mom's belongings following her death, Rita and Sandifer Ferguson discover an envelope buried inside her chest of drawers.  Frail-looking, the envelope had an embossed seal across the back.  Folded inside was a divorce certificate.  Listed on the certificate was a name they didn't recognize and one they certainly did - mom's.
As they sat in the small bedroom, the one their parents had shared for over thirty years, they were speechless.  Finally, Rita spoke up.  "Did you know?"
The question hung in the air.  Neither Rita or Sandifer had known about their mom's first marriage.  For some reason, she had kept this fading envelope with a certificate of divorce tucked away in her bedroom.  
Why?  And who was this fellow she had married and divorced in less than a year?
Lesser Angels tells the story of two siblings - a brother and a sister - who took divergent paths as adults and find themselves in a common pursuit of their family's history: to find the man on the divorce certificate.