While I had a bit of difficulty initially believing that the suave French actor Charles Boyer could be a sea captain, this was a very good installment of "Four Star Playhouse".
When the show begins, the captain receives a wire that his wife has died. Soon after, the captain announces that he's gotten word that the ship has a bomb aboard and so instead of landing at port, he'll keep the ship at sea until the saboteur reveals the whereabouts of the bomb. Many of the crew think the captain's lost his mind...and some wonder if his wife's death has made him unstable. What follows is a very interesting waiting game...making for a nice, tense show.
Overall, this one features nice acting and a nice script. Together, it makes for an episode that is still worth seeing all these decades later...and you can by downloading it for free from archive.org--a site often linked to IMDb pages.