Strolling the picturesque streets of Aire-sur-la-Lys, you will not be long in coming face to face with the many religious buildings that characterize the city. Arousing as much glare as questions, they bear witness to the hold of religion in ancient times. But beyond this remarkable heritage, in the course of narrow alleys, there are small religious enclaves much more discreet: the convents. Penitents, Ursulines, Black Sisters, Grey Sisters and many other congregations who chose the path of faith, also influenced in many ways the lives of the inhabitants of Aire in the forgotten times...