After the tragic death of her husband Bradley, Kelcy returns to her childhood summer home on Cossayuna Lake with her four-year-old son, Seth, seeking a fresh start and a refuge from her grief. The peaceful facade of the lake soon shatters when a near-fatal encounter with her old friend, Chris, leaves her questioning everything. As they rebuild their strained friendship, they begin to uncover dark secrets about the lake, including the mysterious disappearance of Chris's brother, Mark. Together, they discover that Mark's fate is intertwined with Kelcy's family and the eerie occurrences that have haunted the lake for generations. As the past resurfaces, Kelcy must confront the hidden legacy that has bound her family to the lake and find a way to protect her son from the darkness that lurks beneath its surface