From the Netflix entry:
In this series' mix of drama, romance and humor, the London private investigative business of best friends Jeff Randall (Mike Pratt) and Marty Hopkirk (Kenneth Cope) seems over when Marty is killed in a hit-and-run accident. But his ghost returns (visible only to Jeff) to find his killer, leaving a luckless Jeff to handle Marty's devotion to -- and jealousy of -- his wife (Annette Andre), who struggles with his death while becoming a detective.
I've seen the pilot episode, and yes, it is exactly as cheesy as it sounds. *shakes head sadly*
But I had to at least give it a shot, because "detective's ghost returns from the grave to detect his own murder" was a mystery novel I was plotting in high school. Darn those Brits for tackling the idea first!