I just came across this volume by Ross Hastings that was just published in February: <em>Theological Ethics: The Moral Life of the Gospel in Contemporary Context</em>.
>In Theological Ethics theologian, pastor, and ethicist W. Ross Hastings gives pastors, ministry leaders, and students a guide designed to equip them to think deeply and theologically about the moral formation of persons in our communities, about ethical inquiry and action, and about the tone and content of our engagement in the public square. The book presents a biblical perspective and a gospel-centered framework for thinking about complex contemporary issues in ways are life-giving and that will lead readers into greater flourishing as human persons in community.
This book, or something like this book, might be useful in leading your friend to think about what it means to be a human being, the ultimate theological grounding for ethics, and the gospel of Jesus Christ.