Annie MacLeod always knew she was different, growing up on a sailboat in the Pacific Northwest, navigating by stars and swimming with sea creatures alongside her parents and best friend, Evan. But when a tsunami shatters her world, Annie is stranded on land and forced to confront how eccentric she is. In the wreckage, she rescues a wordless man named Walker, who emits a hum only she can hear. His touch gives her visions of the ocean’s hidden world. Yet, even as she is pulled toward him, Evan remains on dry land, offering the stability she may have to leave behind. But then Walker vanishes, along with the answers she needs about who she really is. Six years later, Annie has left the sea and buried the past --- until Walker’s otherworldly sound returns, pulling her back toward the ocean and the life she abandoned.