Personal spirituality in Cathollicism: I can’t recommend Introduction to the Devout Life highly enough. I fell head-over-heels in love with Francis de Sales after that one. A truly amazing man. You’ve never heard a more pastoral voice, ever, anywhere. It’s an old book, so some references are period-specific.
Conversion stories: My husband really liked Surprised by Truth, edited by Patrick Madrid. He’s giving away a couple of copies as gifts to people involved in his Confirmation this coming Saturday.
Liturgy: The Spirit of the Liturgy, Romano Guardini. It’s early-twentieth century, and short (mine is 95 pages). Lovely writing. Beautiful ideas.
Happy reading!