If You liked understandability of the vicar of Christ series, by Father Treacy, listed in the last blog, here are some others, some of which were recently reprinted. All from Paulist press except for the last one which is from Arouca Press.
After Death What? Heaven, Purgatory, Hell
Gifts of the Holy Spirit and Sin, Law, Grace
Stories of Great Saints for Children (at least 3 “volumes”)
Stories of the Apostles for Children
A Handbook of Political Philosophy – Based on the Encyclicals of Leo XIII