Three sisters are preparing to return to the village where their mother lives to commemorate their father's memorial. However, one sister never comes. A few kilometers away, police officer Loukidi discovers the body of a woman, distorted. Is the missing sister the next victim? In their attempt to find her, they will drown in the past. To save themselves, they must swim in the raging river with the secrets that the Mushroom Forest has hidden for so many years.