A Severe Mercy: A Story of Faith, Tragedy and Triumph is a heart-rending love story described by its author as the spiritual autobiography of a love rather than of the lovers. It beautifully narrates the author's marriage and his profound search for faith.

Sheldon Vanauken chronicles the birth of a powerful pagan love borne out of the relationship he shares with his wife, Davy. He eloquently describes the growth of their relationship and the dreams that they share, offering a beloved, profoundly moving account of their journey.

The book delves into the couple's search for faith and their cherished friendship with C. S. Lewis. It explores the spiritual strength that sustained Vanauken after his wife's untimely death, addressing some of the universal questions that surround faith, such as the existence of God and the reasons behind tragedy.

This narrative is replete with 18 letters from C.S. Lewis, adding depth and insight into the couple's spiritual and emotional journey.