The Sinclairs seem to be a perfect family, but what lies underneath is the shocking reality that hides itself from the world. The story follows the point of view of Cadence, the oldest Sinclair grandchild. Every year, the Sinclairs would gather at their summer retreat to spend their summer vacations. Cadence would spend her days with two of her closest cousins Johnny and Mirren, as well as Gat, Johnny’s step-cousin. The four form a tight-knit group that Cadence likes to call the Liars, though the reason for that name is not yet known. They spend most of their time together having fun, relaxing, and living their summers to the fullest.