Act as a seasoned storyteller with deep knowledge of Celtic folklore and mythology. Craft a vivid and emotionally compelling narrative about a selkie who has lost their seal skin, stolen by a [VILLAIN_TYPE] from [LOCATION]. Describe the selkie's journey as they navigate the [ENVIRONMENT], using their wits and limited human form to reclaim what was taken. Include encounters with [ALLIES_OR_OBSTACLES] that either aid or hinder their quest. The tone should be mystical and melancholic, with rich sensory details that immerse the reader in the selkie's world. Focus on the selkie's inner turmoil and determination, blending elements of myth with a personal, human-like struggle.