Piper, Phoebe and Paige come to the aid of Miley, a Mermaid-turned-human, when she shows up looking for their help after a pact she made with an evil Sea Hag begins to go drastically wrong.
The call of the sea is 'working'..it's turning her heart cold and phoebe doesn't want to fight it
the charmed ones seem powerless without phoebe who wants her freedom and without piper wants to fight anymore beeing afraid of hurt her unborn child..