A Letter to the Luminous Deep (The Sunken Archive Book 1)

A Letter to the Luminous Deep is a fantasy novel set in an underwater world featuring magical academia and a penpal romance. E. lives a solitary life in her extraordinary underwater home until she discovers a strange, beautiful creature outside her window. This prompts her to begin corresponding with renowned scholar Henerey Clel. Their letters initially focus on shared intellectual interests but gradually become romantic. When a mysterious seaquake destroys E.'s home, both she and Henerey vanish without a trace. A year later, E.'s sister Sophy and Henerey's brother Vyerin must examine the letters, sketches, and field notes their siblings left behind to understand what happened to them and what their disappearances might mean for the world around them.