Glass Harbor hides more than fog and salt. When Boston homicide detective Eli Mercer returns to the eerie coastal town of Glass Harbor to bury his estranged father, he doesn't expect a murder that mirrors a 20-year-old unsolved case—or for his past to claw its way back from the deep. As bodies surface with hauntingly familiar signs—ropes, conch shells, and cryptic carvings—Eli is pulled into a chilling mystery involving old lovers, unreliable memories, and a sister with visions that may be prophecy… or madness. The fog isn't the only thing watching. And some voices, once sealed, refuse to stay quiet. Atmospheric, gripping, and psychologically layered, The Shell Keepers is a slow-burn thriller with gothic undertones, perfect for fans of Tana French, Gillian Flynn, or Sharp Objects.