Still as the Sea

Lorelei Sallow grew up on Hyeres Island, scraped her knees on the stone, played tag with her water-nymph friends on the cobblestone streets, swam the crystal waters of the reef countless times; her life is this kingdom, her home is this land, but she must leave. As a pickpocket with no real house to call home, nor establishment to call her place of work, her skill and dispensability is valuable to the King. So he sets her on a journey to acquire the Trident of Poseidon in an effort to win the war between Hyeres and Khulna.
Accepting this request, Lorelei finds she has a partner in crime: the King's son. But there's more to the Prince than meets the ocean blue eye.