After watching The Heart Of The Matter for all the exotic atmosphere of a film set in Sierra Leone during World War II what the film boils down to essentially is a Catholic soap opera. Which would follow since it is based on a Graham Greene novel. Had lead character Trevor Howard not been Catholic, would this story had even occurred.
Howard gives a capable performance of a British colonial policeman who is stationed in Sierra Leone caught up in a mid life crisis. He's fallen out of love with wife Elizabeth Allan whom he sends away on money borrowed from a man who the authorities suspect of smuggling, an offensive looked at even more during wartime.
He also embarks on an affair with Maria Schell, an Austrian refugee who were others had been on a life raft for 40 days at sea after Allan has been sent away. That and the fact that he now has the appearance of impropriety has his superiors questioning him after accusations were brought by another civilian Denholm Elliott.
Nothing like Catholic guilt. His theological musings with Father Peter Finch bring him no solace. Howard's troubles are big, but he's his own harshest judge as per his religion.
Although The Heart Of The Matter was well received and it is a well acted story, it hasn't aged well in the past 60 years since it first came out. If anything it's one serious argument against Catholicism should one be considering converting.