**Chapter 1: The Fateful Voyage**

The moonlit waves crashed against the wooden hull of the ship, rocking Iduna and her husband, King Agnarr, as they stood at the bow, gazing out at the endless expanse of Ahtohallan. The Queen of Arendelle's brown hair was pulled back into a coronet braid, and a gentle breeze rustled the edges of her cloak. Iduna's eyes shone with a mix of excitement and trepidation as she contemplated the journey ahead. She had always been driven to understand her daughter Elsa's powers, and the ancient river was said to hold the secrets she sought. King Agnarr, with his strong jawline and piercing blue eyes, wrapped a reassuring arm around Iduna's shoulders. "We'll find the answers you seek, my love," he said, his voice filled with conviction. "Together, we'll ensure Elsa's safety and our kingdom's prosperity." As they sailed deeper into the unknown, the winds began to pick up, and the ship creaked and groaned under the strain. Iduna's grip on the rail tightened as the vessel pitched and rolled, throwing her off balance. King Agnarr held her fast, but a massive wave crashed over the ship, sweeping them apart. Iduna felt herself tumbling through the water, her senses disoriented by the turmoil. She managed to grab hold of a piece of wreckage, clinging to it as the storm raged on. When the waves finally began to subside, she looked around, disbelieving. The ship was gone, splintered and shattered on the rocks. She called out for Agnarr, but her voice was hoarse and barely audible. The sun was rising over the horizon when Iduna spotted a shoreline in the distance. With a surge of hope, she kicked and paddled towards the shore, her exhausted body screaming in protest. As she stumbled onto the beach, she collapsed onto the sand, her vision blurring. When she came to, she was lying on a makeshift pallet, surrounded by concerned faces. A woman with a kind smile and a gentle touch examined her, speaking in a soothing voice. Iduna tried to sit up, but a wave of dizziness washed over her, forcing her back onto the pallet. The woman, a local, explained that she had been found washed up on the shore, half-drowned and shivering with cold. Iduna's memories began to return, and she recalled the shipwreck, the storm, and Agnarr's absence. A sob rose in her throat as she realized her husband was gone, lost at sea. The woman's expression turned sympathetic, and she took Iduna's hand in hers. "You'll be taken to the king's castle, where you'll receive the care you need. His Majesty will want to meet you, I'm sure." Iduna's eyes widened as she wondered what lay ahead, and what the future held for her, a stranger in a strange land, with no idea that her journey would soon intersect with that of the royal family of the Southern Isles, and a young prince named Hans, whose life was about to change forever.