Cracks is set in St. Mathilda 's school .
Set in a strict elite british boarding school called St Mathilda 's in the 1930s , the story centers on a clique of girls who idolize their enigmatic diving instructor , Miss G ( Green ) ( in the film , we learn that Miss G had been a student at the same school where she now works and , in fact , may have even continued on at the school after she graduated ) .
Cracks -LRB-film-RRB-