Diary of a Ghost (2007)

Jasper Taldo, a work obsessed, middle aged, private detective has decided to retire from what can be described as a legendary career of service. His departure is halted by Jessie, a mysterious southern belle who's sister has recently gone missing. Though reluctant at first, Jasper, also known as the Ghost, finds himself intrigued by this all too familiar case and some reemerging faces from is past.