On Charlotte Prince's 16th birthday, a stranger comes knocking. Home alone and left only to her own imagination, the girl builds a world and a family for herself, fancying herself a lonely princess she's snapped from her reverie by the painfully awkward boy next door, Calvin Pennebaker. The pair, once childhood friends have long since entered the gawky social embrace of high school, and no longer speak. When violence enters their perfect suburban world, the boy next door must break every rule he knows, and his geode, to save the day.