It has been more than 80 years since J.R.R. Tolkien’s The Hobbit first appeared in bookstores in 1937—followed by The Lord of the Rings trilogy during the mid-1950s—and the enthusiasm for all things Middle-earth doesn’t seem to be waning anytime soon. While the premiere date for Amazon’s prequel TV series hasn’t been announced yet, another important date in 2021 has: June 24.

On that day, Houghton Mifflin Harcourt (HMH) will release The Nature of Middle-earth, a book of heretofore unpublished writings by Tolkien himself. (HarperCollins will publish an identical edition in the UK.) As avid fans likely already know, this won’t be the first supplemental Middle-earth material in existence. Tolkien wrote prolifically about his fantasy world, and much of his other content was published posthumously—most notably The Silmarillion, an extensive collection of stories edited by Tolkien’s son, Christopher. As literary executor of his father’s estate, Christopher Tolkien edited and oversaw the release of most Tolkien works until his death at age 95 in January of this year.

Time to solve the mystery of which Middle-earthers can grow facial hair.Houghton Mifflin Harcourt

According to Gizmodo, The Nature of Middle-earth was edited by NASA computer engineer Carl F. Hostetter, who also happens to be a venerated Tolkien scholar and the head of the Elvish Linguistic Fellowship (E.L.F., for short). HMH revealed in a press release that this latest compilation will contain previously unknown details about “Elvish immortality and reincarnation,” “the Powers of Valar,” “the lands and beasts of Númenor,” and “the geography of the Rivers and Beacon-hills of Gondor.” It will also reportedly clear up the confusion over which races (and sexes) can grow beards in Middle-earth, a topic that crops up on internet message boards with surprising frequency.

U.S. residents can pre-order The Nature of Middle-earth from Amazon now for $24.

[h/t Gizmodo]