When the Esmeralda, a trading vessel under the command of Captain Clayton Carlisle, wrecks off the coast of New Hampshire's Isles of Shoals in the winter of 1837, survivor Gabriella Montez, a desperate stowaway from Málaga, Spain, finds herself at the mercy of an enigmatic light keeper, Ian McCabe, and his troubled Irish clan. With no safe passage available to the mainland until the spring, she becomes a reluctant guest on the romantic, rocky shores of Star Island, where she must bide her time in pursuit of the mysterious legacy of her great-grandmother, Ruby Sanchez. There, she finds herself engulfed in the strange and tempestuous affairs of Ian's four contentious sisters, who make no secret of their disdain for Gabriella and her exotic, gypsy-like ways. A prisoner on an island of stone, Gabriella is forced to confront the dark rumors and chilling lore that surround the Isles of Shoals and the notorious Keeper of the Light—a tortured poet whose presence she finds both frightening and irresistible. Will she overcome the hidden perils of these legendary, ill-fated shores—or will her very life and legacy succumb to their quixotic, silvery mist?