Once again Bulldog Drummond is planning to marry his fiancée Phylllis. Once again, he gets sidetracked. This time by a mystery involving synthetic diamonds and, of course, murder. This would be the third and final Bulldog Drummond film for both John Barrymore and Louise Campbell. Barrymore would be replaced by H.B. Warner and Campbell by Heather Angel, who returned to the role she played in Bulldog Drummond Escapes. The reason for Barrymore leaving is his alcoholism, which was affecting his performance. Reportedly he had trouble reading lines even when they were written for him on cue cards. You can definitely see something is off with him here. He shouts all his lines, for one thing. I'm not sure of the reason for Campbell's departure. This was the biggest role of her short career and I think she was very good. But I admit Angel was better so I'm not terribly upset over the replacement. The rest of the cast of regulars that would continue on with the series (John Howard, Reginald Denny, E.E. Clive) are fine. Clive has some of the movie's best scenes. There's a nice supporting cast that includes Halliwell Hobbes and Porter Hall. As with most of the entries in the Paramount series, this is a middling B detective flick with a short runtime. This one passes the hour mark (barely) but the last couple didn't even do that. I don't mind the runtime. It works fine for this type of picture. It's not like Paramount was doing anything innovative or unique with this series, after all. It's just this one is pretty dull. Still, if you're fan of the series you will want to see it. If nothing else, see it for the scene with the cool old-school sci-fi laboratory.

Hugh Bulldog Drummond (John Howard) is about to marry his great love, Phyllis, when the wedding has to be delayed.One lovely wedding gift they received was a beautiful diamond, which turns out was created by the father of Phyllis' friend Gwen. He is very excited about presenting a paper at a conference and to be the first one who has created the gem. He's interested in credit, not money; in fact, he plans on giving the formula away.At the party to celebrate the upcoming nuptials is Sir Raymond Blantree, a jewel magnate. He wants the formula and Gwen's father, Professor Goodman to sink the invention before it wrecks the value of jewels everywhere. The oil companies have done this for years with alternate fuel patents.Professor Goodman isn't inclined to sell. Everybody wants this formula, and in fact, a detective at the party is found murdered as a result of the diamond itself being stolen. When Blantree finds out that Goodman is going to borrow equipment from a gemologist, Dr. Botulian, he devises a plan to steal the invention.Little does he know that Dr. Botulian has a plan of his own. Well, this is where the movie goes off the rails. Blantree is having someone impersonate Dr. Botulian and show up at 9 p.m. Botulian himself plans on showing up earlier. Unfortunately I just couldn't tell who was who and before you knew it, I was totally confused.John Howard is a dapper and charming Drummond, and Algy (Reginald Denny) and Tenney (E.E. Clive) are on hand to help him do what he can to catch the criminals. Not on board and mad as hell and not going to take it anymore is the Colonel (John Barrymore) who is sick of Drummond's machinations. He's great. Phyllis (Louise Campbell), who thought her future husband was retiring, at one point tells him she never wants to see him again. We know she doesn't mean it.Of course today we have all kinds of lab-created diamonds: Brilliant Earth, Moissanite, Affinity, etc. Brilliant Earth and Moissanite cost a fortune. I would have told Blantree, if you can't beat 'em, join 'em.

In this episode captain Drummond tries to find the killer of various people. All assassinations were provoked by a diamond of great value, but Drummond will face the danger.John Barrymore is in this, but not playing Drummond.I've seen a few of these Drummond films and am not a huge fan of them.. Maybe because they are so dated. Unsure.This one is typical of the others but Barrymore is interesting to watch.That's about it.

Another trip to the altar for Bulldog Drummond is averted when at a pre-wedding gathering in Switzerland a Swiss detective is murdered and an artificial diamond, courtesy of its inventor Halliwell Hobbes to bride and groom John Howard and Louise Campbell. That sets off a round of a little over an hour of fast paced adventure as Drummond once again shows up Scotland Yard.Bulldog Drummond's Peril steps into the realm of science fiction with Halliwell Hobbes inventing a machine that can create diamonds, a process we know takes millions of years of geologic pressure. The gizmo he has looks like it was made from spare parts in Dr. Frankenstein's laboratory.The film is blessed with two villains, industrialist Matthew Boulton and rival scientist Porter Hall both of whom want to get their hands on that formula and profit off it in some way. One way that wasn't even considered was that very few diamonds are used as jewelry. The majority are industrial strength and used for things like oil drill bits. A way to manufacture those babies on the cheap would yield someone a lot of money.John Barrymore plays the Scotland Yard inspector and by dint of his name is top billed over John Howard as Drummond. It's a sad come down for Barrymore who reminds me of J.D. Cannon as Chief Clifford in the McCloud series, the way Drummond constantly shows up the Yard. He also has a little bit of Perry White thrown in as he constantly is telling people 'don't call me inspector'.The science is a bit bizarre and the plot has way too many holes in it. If you're expecting something as good as when Ronald Colman was Bulldog Drummond, you won't find it here.