This is one of my top 50 favorite movies. Everybody is great in it from Patrick Swayze, Demi Moore to Whoppi Goldberg. Even the two villians were excellent though I heard that the actor who played Willie Lopez actually passed away not long after making the film.
Sam Wheat a banker, is murdered during a mugging while coming from a show with his girlfriend Mollie. For some reason Wheat is still walking the Earth, now in ghost form. He follows Mollie and finds that the killer was really after a password that he had to authorize funds transfers through the bank. Now Mollie is also in danger from the killers and Sam feels helpless.
Sam then happens upon Goldberg, who is running a scam as a medium who can communicate with the dead. Apparently, Goldberg can hear Sam talk so Sam uses Goldberg to try to communicate with Mollie and warn her of danger.
Sam then realizes that the only way to protect Mollie is to be able to use some sort of physical force. The only problem is as a ghost he has no physical substance so he cannot touch anything. Or can he? Sam learns that maybe he can touch objects when he encounters another ghost who is able to do just that. The other ghost turns out to be one of the most entertaining characters of the film.
The movie has it all from a love story, to excellent comedy, fairly decent special effects and a great story.