Five children meet on their first day of school, one bright September morning.
Drawn by that magical spark of connection that happens to the young, Gabby, Billy, Izzie, Andy and Sean - each bursting with their own personality, all with strikingly different looks and diverse talents - soon become an inseparable group, known to everyone else as the Big Five.
As they grow up, their seemingly perfect lives are altered by families falling apart, unfortunate mistakes, and losses and victories great and small.
Throughout their adolescence, the five are able to turn back to their trusted group to regain their footing and steady their course.
But as they emerge from school, their futures seem neither safe nor clear.
As their lives separate, the challenges and risks they face become greater, the losses sharper, and it becomes much harder to know the right path to choose. But despite life's ups and downs, together they are able to face up to challenges with the help of the important bonds forged all those years ago. And the five realise just how lucky they are to treasure valuable friendships that last a lifetime.