Lady in the Water is a 2006 American fantasy thriller film written and directed by M. Night Shyamalan and starring Paul Giamatti and Bryce Dallas Howard. The film's plot concerns a Philadelphia maintenance man who discovers a young woman in the swimming pool of his apartment complex. Gradually, he and his neighbors learn that she is a water nymph whose life is in danger from a vicious, wolf-like, mystical creature that tries to keep her from returning to her watery "blue world". Wikipedia
Harry Farber: This is like a moment from a horror movie.