When a girl disappears from Crescent Harbor, the sea isn't the only thing keeping secrets. Hazel Moran has spent years trying to rebuild her life and her fractured friendships in the quiet coastal town she once ran from. But when a mysterious package arrives at her antique shop-containing an antique compass and a set of cryptic coordinates-her world shifts like a tide pulling her back into the past. Hours later, Violet Gray walks through her door with devastating news: her younger sister, Lily, never came home. Drawn into the search despite old wounds and buried guilt, Hazel follows the trail into the fog-laced cliffs, forgotten tunnels beneath the lighthouse, and a pattern of disappearances Crescent Harbor has quietly carried for decades. Each clue leads deeper into a mystery someone is desperate to keep hidden. And as Hazel is forced to rely on Quinn Hale-the childhood friend she lost and the steady presence she never truly forgot-long-slumbering feelings stir between them. But trust is fragile in a town built on half-truths. Someone is watching. Someone is warning. And someone knows the real reason Lily vanished. To save her, Hazel must confront the shadows of Crescent Harbor... and the ones she carries within herself. Atmospheric, emotional, and filled with slow-burn suspense, LAST KNOWN COORDINATES is the haunting first novel in the Crescent Harbor Mystery series. Perfect for readers who love: small-town secrets lighthouse lore and coastal danger found-family threads gentle romantic tension mysteries that unravel through clues, not gore cats who always know more than they should