Agatha Christie's Poirot (1989)

David Suchet's fussy, vain, brilliant Belgian is the most complete screen version of Christie's detective: across 70 episodes and nearly 25 years, the series filmed nearly every Poirot novel and story. The early hour-long episodes, with Hugh Fraser's Hastings and Philip Jackson's Inspector Japp, are the coziest stretch, full of Art Deco flats, country houses and wry banter. The later feature-length films grow grander and occasionally darker, so start in the first few series if a light mood matters most.