Watch on 123Movies. Saltwater centers on Peter, a lonely lighthouse keeper still grieving his late wife, who rescues a mysterious woman washed ashore, only to discover she is a Selkie whose survival depends on repairing her torn coat. As she withers without the sea and he clings to the fragile The connection she brings into his world, Peter faces an impossible conflict: protect her by restoring the coat that will let her leave him forever, or keep her close and watch her die.