The story ends suddenly, however, this leaves you with a headache of how to solve the mystery! A good story must plot enough evidences and clues for it to being solved and this story may be one of them!
SPOILER: some clues I think: They were 4 persons (not 3) who were hired to kill Saeed (one was waiting outside/inside the house to ambush the victim). Homa was pretending to be a friend but she actually was one of the killers who had come along with Saeed! ...
SPOILER: some clues I think: They were 4 persons (not 3) who were hired to kill Saeed (one was waiting outside/inside the house to ambush the victim). Homa was pretending to be a friend but she actually was one of the killers who had come along with Saeed! ...