Cardinal virtues (Justice, Prudence, Fortitude and Temperance) are age-long moral concepts that have a lot of philosophical background, yet with abundant theological understading. Coming from the latin word "cardo", meaning hinge, they stand for the basic, fundamental moral norms on which other virtues are built. They are sometimes also called human virtues to distinguish them from the theological virutes of Faith, Hope and Love.
This series makes them even better understood for the young ones and all young at heart.