The Millers are far from perfect. Estranged siblings Beck, Ashley and Jake find themselves under one roof for the first time in years, forced to confront old resentments and betrayals, when their mysterious, eccentric matriarch, Helen, passes away. But their lives are about to change when they find a secret inheritance hidden among her possessions--the Florentine Diamond, a 137-carat yellow gemstone that went missing from the Austrian Empire a century ago.