"The Hardest Thing to Do" is book four in a most wonderful series. I marvel at the way Penelope has imagined the whole world of St. Alcuin's Abbey, peopling it with fine, deeply human characters and plotting it with startling surprises and satisfying resolutions, and then giving us that world through her novels.
If a monastic community in the 1300s sounds too far removed from your daily life to be remotely relatable, then think again. The men of St. Alcuin's are each distinct unto themselves (and they become more themselves as you meet them in each episode) but they are Everyman too. The essential struggles of being human- choosing and renouncing, becoming and accepting, receiving and losing, growing and remembering- are their struggles, and yours and mine too.
The other thing I really enjoy about this series is their integrity, by which I mean that they have no pretense. They're not a story varnished with "Christianity" so that they can stay within the bounds of "Christian Fiction." Instead, they're the stories of men who've sworn to lay down their very lives for a Risen Christ. The brothers' preferences and attitudes, their time and energy, their animosity and comradeship, their doubts and prayers and work and calling- it finds its grounding in the Gospel.
Because of this, and thanks to the sensitive heart of the author, the character's conversations and meditations (and most of their meditation is really wrestling with God!) show us what they're learning about life and the One who gives it. There's a lot for a thoughtful reader to think about, and it all belongs to the characters of the story. It's not an awkward sermonette from an author, who interrupts the story to deliver a Christian PSA.
Because of this, if a non-religious friend thought the books sounded interesting, I'd loan them in a heartbeat.
If I've piqued your curiosity at all, do yourself the favor and get this series onto your shelf.