While this is billed as a loose adaptation of Augustine’s confessions it is much more than that. It is a riveting sci fi thriller, with some interesting speculation on alien life forms and
excellent apologetics mixed in.
For someone curious about Catholicism this would be a great first choice. The conversations between Austin and Fr Ambrose go over some classic apologetics and the overall emphasis on the centrality of love will appeal to those left cold by appeals to morality (goodness) or reason (truth). I’ve recommended it to everyone I know who is interested in Catholicism and or Sci Fi.