The book will be published by Top Shelf in the US and by Knockabout in the UK. Here's the details from the Top Shelf website:
In a world where all the fictions ever written coalesce into a rich mosaic, it’s 1975. Janni Dakkar, pirate queen of Lincoln Island and head of the fabled Nemo family, is eighty years old and beginning to display a tenuous grasp on reality. Pursuing shadows from her past—or her imagination—she embarks on what may be a final voyage down the vastness of the Amazon, a last attempt to put to rest the blood-drenched spectres of old.
With allies and adversaries old and new, we accompany an ageing predator on her obsessive trek into the cultural landscape of a strange new continent, from the ruined city of Yu-Atlanchi to the fabulous plateau of Maple White Land. As the dark threads in her narrative are drawn into an inescapable web, Captain Nemo leads her hearse-black Nautilus in a desperate raid on horrors believed dead for decades.
Through the exotic spectacle of an imagined South America, Alan Moore and Kevin O’Neill steer their fifty-year-long Nemo trilogy to its remarkable conclusion, borne upon a RIVER OF GHOSTS. -- a 56-page full-color hardcover, 6 5/8” x 10 1/8”, co-published by Top Shelf and Knockabout.
Top Shelf website: