The Unwritten Law is a 1916 drama

Rich but frivolous, Cynthia and John Karslake obscure their love for each other by their constant quarreling. Cynthia grows jealous of her husband when, one day at the races, she notices Vida Phillimore, a recent divorcée, flirting with him. Using this incident to inflame all her other petty grievances, Cynthia ends up in divorce court presided over by Vida's ex-husband, Judge Phillip Phillimore.