Police Seek Nun As Witness In Downtown Slaying! Appointment with Danger is directed by Lewis Allen and written by Richard L. Breen and Warren Duff. It stars Alan Ladd, Phyllis Calvert, Paul Stewart, Jan Sterling, Jack Webb, Stacy Harris and Harry Morgan. Music is by Victor Young and cinematography by John F. Seitz. Al Goddard (Ladd) is a U.S. Postal Inspector sent to investigate the grim murder of one of his colleagues. There's a witness to locate and possibly protect, a nun, Sister Augustine (Calvert), and soon enough Al has to go undercover as a crook to infiltrate the gang responsible for…