Which C.S. Lewis work was published posthumously in 1964 as a book about grief?

A Grief Observed was published posthumously in 1964 as C.S. Lewis’s book about grief after his wife’s death.

Lewis wrote the work after Joy Davidman died of cancer in 1960. It presents his direct, unsettled reflections on bereavement, faith, anger, memory, and the difficulty of reconciling suffering with belief in a loving God.

The book was first published under the pseudonym N.W. Clerk. Lewis used the pseudonym partly to prevent readers from approaching the text as a conventional work of Christian apologetics. The author’s identity became known later, and subsequent editions were published under Lewis’s name.

A Grief Observed differs sharply in tone from some of Lewis’s more systematic religious books. It is not a simple set of answers about suffering; it records a personal process of questioning and emotional change. Lewis died in 1963, and the book appeared the following year.