The End of the Day by Claire North (Orbit, 2017) A poignant dip into humanity’s ills and ailments (beautifully written though spoiled somewhat by all the interspersed conversational snippets). North does ultimately answer the question ‘What is Death?’ but the journey is gruelling and the protagonist has less personality than a window.
Reaper Man by Terry Pratchett (Gollancz, 1991); audiobook read by Nigel Planer (Transworld, 1995) Having given Death a personality, Pratchett next postulated the consequences of him having to die. Since this was still quite early in the Discworld saga, the result is mostly comedic mayhem (although Death’s relationship with Miss Flitworth is both sweet and philosophical).
Mort by Terry Pratchett (Victor Gollancz, 1987); audiobook read by Nigel Planer (Isis, 1995) Mort is the book with which Terry Pratchett’s Discworld series turned from imaginative curiosity to comedic fantasy par excellence. The plot is atypically focussed for Pratchett, and Death (who in a mid-life crisis takes on an apprentice) becomes an instant fan favourite.
Deathhunter by Ian Watson (Gollancz, 1981) In attempting to cure his patient’s delusions, death guide Jim Todhunter must confront the possibility that Death is a creature to be captured and caged. Deathhunter combines slightly cumbersome world building with trippy existential ideas. It’s SF styled with a 1980s twist.