Friends since earliest childhood, Annie, Jake, and Mason have a special bond. When Annie's parents die on the same night that she and Mason get married, the three friends decide to raise Annie's infant sister, Opal, together. Not surprisingly, their bonds of intimacy, already deeply entangled, become strained. As Annie struggles to be both a sister and a mother to Opal, and a wife and friends to Mason and Jake, events take on a momentum of their own. And then, one fateful night, the three friends goad each other into stepping over a line, with shocking, unforeseen consequences for each of them.