A Current List of Fiction Books On Existentialism

I believe reading of fiction touching on the subject of " existentialism " is really "heavy reading " stuff. It needs a lot of patience to digest these kind of "stuff". By any chance, do we have "die-hard" readers of this sort recommending any latest book titles by the previous century and this century's writers from the Eastern and Western Hemisphere.
:-)

Having originally been poiinted to the novel, When Nietzsche Wept, by irvin D. Yalom, I subsequently acquired, what I considered his "magnum Opus". Existential Psychotherapy (written when he was a professor of Psychiatry at Stanford Medical School). As I plodded through this, I began reading his other novels: Love's Executioner; The Gift of Therapy; Schopenhauer's Cure; Momma and the Meaning of Life; Lying on the Couch; Love's Executioner; Lying on the Couch; Every Day Gets a Little Closer. Incidentally, available from Amazon.com: When Nietzsche Wept ~ (DVD - 2007)
Buy new: $14.98 Used & new from $4.75.