GHOST

Sam and Molly are a very happy couple and deeply in love.
Walking back to their new apartment after a night out at the theatre, they encounter a thief in a dark alley, and Sam is murdered.
He finds himself trapped as a ghost and realises that his death was no accident.
He must warn Molly about the danger that she is in.
But as a ghost he can not be seen or heard by the living, and so he tries to communicate with Molly through Oda Mae Brown, a psychic who didn't even realise that her powers were real. Another take:
Sam Wheat and his fiancée Molly Jensen live in Manhattan.
Sam has a high powered job at a local bank, and Molly works on ceramic art.
Sam's friend Carl Bruner also works at the bank.
Sam holds the passwords to some of the bank's major accounts.
While returning home from a movie theater, Sam and Molly are attacked by a mugger named Willie Lopez.
As Sam and Willie struggle over Willie's gun, a shot rings out, and Willie runs off.
Sam chases Willie, but Willie escapes.
Sam then runs back to Molly to see if she's alright -- but Sam finds himself dead in a devastated Molly's arms, and Sam realizes that he is now a ghost.
Later, Willie finds Sam and Molly's home, and breaks in while Molly is busy in the bedroom. Sam scares Willie off before Willie can do anything.
Molly didn't even know Willie and Sam were in the place.
Sam follows Willie to his home, and wants to have Molly turn Willie in, but Sam can't communicate with Molly because Molly can't see him or hear him.
Sam visits spiritualist Ona May Brown, who can hear him, but not see him.
When Sam convinces Ona May to talk to Molly, Molly refuses to believe what Ona May says, and Carl tells Molly to have nothing to do with Ona May.
Sam follows Carl to Willie's apartment, thinking that Carl is about to confront Willie, but instead, Sam watches in shock as Carl chews Willie out for killing Sam.
Willie was not supposed to kill Sam -- Willie was supposed to steal the account passwords from Sam's wallet for Carl, so Carl could carry out a drug money laundering operation.
Now Sam and Ona May must protect Molly from both Willie and Carl, who thinks the account passwords are in Molly's home.
Another take
Sam Wheat is bank executive, who has moved in with his girlfriend, Molly.
One night while out on a date, a man comes out of nowhere and pulls out a gun and demands Sam's wallet, Sam was about to give it to him when a scuffle broke out and Sam was killed.
But Sam's spirit remains on Earth and is walking around and encounters other spirits, who tell him about his transformation.
Sam hangs around Molly and despite her not knowing it is watching over her.
One day the man who killed him breaks into the apartment and Sam stop's him before he could do anything to Molly.
Sam follows him and discovers where he lives but unfortunately can't tell anyone. Sam then meets a supposed spiritualist, Oda Mae Brown, who is so obviously a huckster but who doesn't know that she can hear the dead.
so when Sam speaks he hears her. He convinces her to tell Molly about the guy who broke into the apartment.
Molly then goes to the police and they in turn tell her that Oda Mae's a con woman. She then tells her friend, Carl about what Oda Mae told her.
He goes to investigate and Sam goes with him and discovers something terrible.
Another Take
Sam Wheat was murdered during a date with his girlfriend Molly. Sam's spirit, in a mysterious manner, remains on the Earth, unseen to normal people. After following his murderer, Sam realizes that his death was not an accident, and that molly is in danger. Sam's ghost try to warn Molly, but she does not know it is really there. Then he meets a spiritualist named Oda Mae Brown, who can hear the dead. Sam speaks to hear and convince her to help him save Molly.