Season 2 of the series is based on the middle book of the trilogy, The Subtle Knife, and sees Will Parry (Amir Wilson) and Lyra Belacqua (Dafne Keen) joining forces when they find themselves both trapped in a strange world. New actors for the second season include industry veteran Terence Stamp (Superman II, The Limey, The Phantom Menace, Valkyrie) and Andrew Scott (Fleabag, Sherlock).
Season 2 of His Dark Materials will air on the BBC in the UK and HBO in the USA this autumn. Work on adapting the third and final book, The Amber Spyglass, has begun, although as of a few months ago the producers were still trying to decide if they were going to cram the large volume into one season or expand it out to two.
Philip Pullman, author of the novel series, is currently working on the concluding volume of the Book of Dust prequel/sequel trilogy.