A marine biologist's search for an undiscovered species of octopus leads her to an isolated island where long-buried memories rise like specters from the deep, intent on dragging her darkest truths to the surface...

From the author of The Entirely True Story of the Fantastical Mesmerist Nora Grey, this hauntingly evocative novel is perfect for fans of Emilia Hart's The Sirens, Sarah Penner's The Amalfi Curse, and Adrienne Young.

Twenty nautical miles off the coast of Boston lies Bell Island, shrouded in fog, mystery, and legend. Historically a refuge for women fleeing the hysteria of the Salem Witch Trials in the 1600s and a way station on the Underground Railroad for runaway slaves in the 1800s, the island is isolated and rumored to be haunted by spirits and . . . other things.

It is to Bell Island that microbial biologist Harper Hafdóttir ventures in search of evidence of a new species of octopus, Thalassa, possibly lurking below the swirling water's surface. Along with her equipment, and her luggage, Harper carries with her the burden of past trauma and vivid, recurring dreams.

Swept up in unexplained phenomena ranging from increased seismic activity and a boat-capsizing rogue wave to encounters with island creatures that defy explanation, Harper looks to the island's venerated if mysterious mayor for answers. Lady Loreana Bell comes from a single matriarchal line that has ruled the island for 400 years--and seems to have been expecting Harper's arrival.

It is within the walls of Bell Manor--its gothic grandeur matched only by the intensity of Harper's deja vu--that she discovers the 1690 journal of a young woman in the grips of a religious cult. As a tsunami threatens the island, Harper finds herself on the verge of a revelation that will ultimately unlock the mystery of her haunted dreams and disclose her true purpose on Bell Island . . .