Parnell Hall was an American mystery writer. His works include the Puzzle Lady and the Stanley Hastings series, as well as the screenplay to the 1984 cult classic C.H.U.D. From Wikipedia
The six-part adaptation of Parnell Hall’s cosy crime novels brings Phyllis Logan’s crossword-obsessed sleuth to Bakerbury in a Belfast-shot drama that reviewers say echoes Ludwig without its wit