Popsugar Entertainment Books 18 Long Books That Are Actually Worth the Time Investment 30 October 2020 by Lisa Robinson View On One Page Photo 18 of 18 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 18 All Souls Trilogy by Deborah Harkness Several group members recommended the All Souls trilogy by Deborah Harkness, which was also adapted into a TV series. Previous Next Start Slideshow Book RoundupBook ClubsBooks