Rowena aspires to innovation. As a portal keeper, she's learned how to grow and shape doors that let the people of Albion step from one place to another. Now, she wants to do something that's not been possible for centuries, crafting portals that cross open water. She has more than a few tricks up her sleeve that might make it possible. Thom has a problem. Something has gone wrong in the Orkney waters. The winter storms aren't fading, the currents are stronger than ever, and his Gran's had a vision. Following her instructions, he finds Rowena, a woman whose background utterly confuses him. He's a selkie. He knows the water and its dangers. The land is another problem entirely. Thom isn't sure how Rowena can help him, even though she quickly forms a plan. Finding mysterious stones glinting like diamonds is only the first step. No plan ever lasts for long, and when they stumble across a house on the northern coast of Scotland with a tall yew hedge that absolutely shouldn't be there, they have to investigate. It's the only hope for figuring out what's disturbing the waters of the Pentland Firth and all who live there. Join Rowena and Thom for adventures all through the ocean! Unknown Depths is full of the magical ecology of Orkney, what happens when magic is bottled up for too long, and what freedom and hope feel like. Set in 1949, it explores the northern coast of Scotland and Orkney, along with the finfolk and several other legends.