A Masterpiece of Murder (1986)

Dan Dolan is an ex-Beverly Hills police detective who's down on his luck after a losing streak at the races. When wealthy art collector Jonathon Hire picks Dolan to head security at the social event of the year - Hire's own birthday party - Dolan jumps at the opportunity. But at the party, two things go disastrously wrong for Dolan: he bumps into Frank Aherne, a former millionaire cat burglar who Dolan once sent to jail; and Jonathon Hire is mysteriously poisoned.