Dark Water is literally full of dark water. Brown, muddy, rusty looking water. This water pours out of a leak in the ceiling of the house of Dahlia (Jennifer Connelly) and her daughter Cecilia (Ariel Gade). Theirs is a small, dark and depressing house where Dahlia is forced to roost 'cause she is in the middle of a divorce with her husband and has hardly any money.
One fine day, poor Dahlia discovers her little girl is playing with imaginative friends. On further probing, she discovers that the friend is a little girl called Natasha, her daughter's age. This disturbs her. On top....