The film tells the story of a magician with a haunted past. He seems happy with the woman in his life, but is forever distracted with the goings-on around him. There is a woman in his building (Konkana Sen Sharma) whom he spots walking dazed on a beach, her footprints on the sand face backwards. Then there’s a mysterious girl Lisa Dutt (Kalki Koechlin) who seems to have come back from the dead to haunt him.
Huma Qureshi, his ladylove, entreats him to change the apartment as his past memories are associated with it. Yet, there are moments when the needle of suspicion swivels towards her as well.
Of the three ladies, who’s the daayan?
"'Ek Thi Daayan' is … about a witch and a magician. The mystery is that there are three possible 'daayans' and you guys will probably have lots of competition trying to guess which of us is the daayan," Kalki Koechlin has said about the film.