Love Can Be Murder (1992)

Elizabeth Bentley is a successful lawyer who suddenly has some "punkish" daydreams of being "Rambo" right around the time her clueless boyfriend Brad asks her to marry him. After a therapy session, she quits her job to the surprise of her family and Brad, and goes into the detective business, opening her own private-eye office. Unfortunately, the ghost of the private-eye who owned the office still lingers and Elizabeth's the only one who can see or hear him. At first, she becomes an unwilling partner in Nick Peyton's unfinished investigation, but then she finds herself falling for the salty, but dead, guy.