Anne Crawford,Margaret Rutherford,Donald Sinden,Dora Bryan,Nicholas Phipps,Glynis Johns
Caroline is a prim and pretty schoolteacher who while on vacation meets Miranda, a beautiful mermaid. Upon discovering that they lookalike, Miranda decides she wants to spend some time ashore impersonating her new friend. All that is needed is a suitable excuse for Caroline to be confined to a wheelchair, and a nurse. With the details in place, Miranda is left to cast her seductive spell and turns everything upside down.