The Hollow Tide

A crack has opened in the mid-Atlantic, and the ocean is draining into it. Marine cartographer Lira Voss never wanted to follow her father's obsession with the impossible fissure, but his death left her the only person alive who can read the encoded charts pointing to what lies beneath. Now, descending with a crew of five into a luminous subterranean world governed by its own ancient rhythms, Lira faces a reckoning: the map promises revelation, but the cost of reaching it could collapse an entire hidden ecosystem—and everyone inside it.