If you want a really good version of Death rounding up the horsemen for the Apocalypse, go read Thief of Time by Terry Pratchett. I admit it is the last in a character arc series, but even if it's your first book from Sir Pterry you'll not be left swimming in the deep end. He's very good at summarizing who someone is even if they are a well established character by that point. Like how Death can have a granddaughter even though he is an anthropomorphic personification of a concept and does not, in fact, have genitals. (Some things go deeper than genetics)