In 1985, Lore Rivera marries Andres Russo in Mexico City, even though she is already married to Fabian Rivera in Laredo, Texas, and they share twin sons. Through her career as an international banker, Lore splits her time between two countries and two families --- until the truth is revealed and one husband is arrested for murdering the other. In 2017, struggling true-crime writer Cassie Bowman encounters an article on the internet detailing that tragic final act. Cassie is immediately enticed by what is not explored: Why would a woman --- a mother --- risk everything for a secret double marriage? But the more time she spends with Lore, the more Cassie questions the facts surrounding the murder itself.