The Gorilla Man 1943 Screenplay by Anthony Coldeway, direction by D Ross Lederman. Anthony has a 153 credits on his IMDb page, he started in 1911 and the last one listed is in 1957. A couple of titles from the sound era are familiar. D Ross started a bit later, 1925, and he still has a respectable 150 plus credits on the IMDb. He directed features pretty much from the get go through 1950, the last 7 years of his career were in TV. I know I've seen Tarzan's Revenge, Adventure In Sahara, a couple of Lone Wolf movies and a Boston Blackie, and The Return Of The Whistler.
The guy in the middle is John Loder and he's Captain Killian, the man the newspapers have dubbed the Gorilla Man for his climbing ability. The other two are Paul Cavanagh as Dr Dorn and John Abbott as Dr Ferris. The two doctors are Nazi spies, they hear of the daring raid that Killian lead on a German instillation in France. Killian was hurt in a grenade blast during the raid and he's being brought to the UK in a ship that lands near where Dorn has a clinic overlooking the sea. Ferris is a wanted murderer and he likes to experiment on people, experiments that kill them if they're lucky.
Dorn arranges to have Killian taken to his sanitarium by having Ferris be on hand when the small rowboat carrying Killian lands on the beach near the sanitarium. Handy, huh. No matter, the doc's trick everyone into believing that Killian is a bit out of his mind to discredit the info Killian has on a German raid planned a couple of weeks later.
Killian is on to their tricks so the Nazi scum raise the stakes and have Killian framed for the murder of the wife of one of his men. He had been to the apartment to see her that evening, he delivered a letter to her from her dead hubby. The letter, Ferris lying about not seeing Killian leave the building and an open 2nd floor window are evidence the police detective can understand. Killian is arrested and charged but he escapes and the man hunt is on.
It's a nice tight little spy thriller, there's only 64 mins and they move along at a nice clip. There's more murders and plenty of running about. There's a bit of goofy romance near the end but nothing I can do about that. I enjoyed it and would watch it over again. Lucky for me, I bought the Warner Archives DVDr. I couldn't find the movie on YouTube, there's a bit of clip in the link above.