Final answer:
In Agatha Christie's 'Murder on the Orient Express,' Hercule Poirot is presented as the most trustworthy character due to his meticulous and dedicated approach to solving the crime.
Step-by-step explanation:
In the novel Murder on the Orient Express by Agatha Christie, the most trustworthy character is arguably the detective himself, Hercule Poirot. Poirot is a meticulous and dedicated detective, known for his attention to detail and exceptional deductive skills. He approaches the investigation with a level of professionalism and an unbiased perspective that makes him stand out among the characters as someone who can be trusted to find the truth.