***SPOILERS***Boxing trainer Sam Worth, Henry Lascoe, suspects that his fighter Larry Robb, Buddy Thrope, is planning to throw the big fight in the garden-Where he's a 3 to 1 favorite-in order to pay back mobster Danny Blake, James Bender,the gambling money he owes him. Hiering private detective Mike Barnett, Ralph Bellamy,Sam has him check out Larry's training program to see if he's really serious in winning the fight. It soon becomes apparent to Barnett that Larry is not only going to throw the big fight but that his brother Joey, Ed Shelton, is also in on the fix.
With Barnett trying to get both Larry and Joey to change their minds in them in going along with Blake's plan he soon gets kidnapped by Blake's goons and given a violent work over. On the eve of the fight it's Joey who finds out that he's being cut out of his share of the money and when he's about to turn against Blake and get his brother Larry not to throw the big fight he's double crossed and shot and killed by his girlfriend Carol Carole Mathews, who's in fact really Blake's lover as well as partner in crime.
***SPOILERS*** It's when Barnett came too, from being knocked unconscious, and made it to the arena he tells Larry, after escaping from Blake's goons, the bad news of his brother Joey's murder as well as being double crossed by Blake. It's then that Larry comes to his senses and after being nothing but a punching bag in the ring knocks his opponent senseless in the 7th round with Barnett, now fully recovered from his injuries, doing the same to both Carol and her boyfriend Blake before they can make their getaway from the police. As for Larry he got his revenge as well as pride back in doing the right thing, in not throwing the fight, which if he did could have ended his professional career in boxing.