Someone decides to take their own life by jumping from the top of a building. Who was this person? Why did they do it? Could it have been prevented? This is how 'La caja de arena' (The Sandbox) begins, a series about school bullying that, over its six episodes, unravels the weeks leading up to this tragic event. It's a complex puzzle that comes together through six different perspectives, those of each of the young people involved. It's a shocking, heart-wrenching story, but one that leaves room for hope by reminding us that school bullying is everyone's concern.