Gravity Falls: Lost Legends

XQWLWOHG PBVWHUB ERRN (which decodes to UNTITLED MYSTERY BOOK using the caesar cipher) is the first Gravity Falls graphic novel. It was announced at D23 on July 14, 2017 at Alex Hirsch and Daron Nefcy's panel promoting Gravity Falls: Journal 3 and Star and Marco's Guide to Mastering Every Dimension, respectively. Amazon Canada has the release date listed as July 24, 2018.