Amelia returns in a tale full of mystery and adventure, continuing her extraordinary experiences from the first book, "Where Trees Whisper Secrets". During a holiday trip with her mother and sister, Amelia discovers a polluted fjord, which becomes a source of great concern. Suspecting that a nearby factory is to blame, she turns to the mystical guardian of the forest, whom she met during her previous adventures.

The guardian, recognizing the threat to nature, sends Amelia on a mission to the distant forests of Hardangervidda, where she must seek out Fossegrim - a legendary figure connected to the waters. Amelia embarks on a journey to uncover the truth and find a way to save the fjord. Her travels through the rugged landscapes of Norway become not only a fight for nature but also a confrontation with businessmen determined to pollute the environment at any cost.

"Whispers of the Fjord" is a story of courage, determination, and collaboration with mythological figures who assist in the fight to protect nature. In this book, Scandinavian and Slavic folklore merge into a realistic tale of the power of nature and the challenges faced by those who strive to defend it.