**SPOILERS**Being a good neighbor Dr. Robert Ordway, Warner Baxter, after being summoned to his next door neighbors house party in the hope that he'll revived the out cold Walter Foster, George Meeker, who passed out after he took a couple of drinks. The celebrated crime doctor sees that Walters condition is the result of Walters drinking and forgetfulness of him taking his daily insulin injection. After getting the insulin kit from Walter's overcoat Dr. Ordway gives him a shot in the arm and within seconds Walter, regaining consciousness, is as good as new. Then inexpediently seconds later he goes into a series of deadly convulsions and expires.
It's obvious that someone at the Foster party pulled a switcheroo substituting the insulin for poison to take Walter out of his life as well as the killers hair. But with some two dozen people at the party who was it! It becomes evident from watching the movie that this creepy looking undertaker Karl Ganss, the Joesph Geobbles looking Martin Kosleck, and his hulking henchman Casper played by the TV "Millionaires" Marvin Miller-look alike Marian Miller were responsible for Walters death. As we later find out, together with Dr. Ordway, that there's a lot more then meets the eye in this murder mystery and that has to do with who the two weirdo, Ganss & Casper, are working for. And far more important whats the motivation, besides money, that their doing what their doing.
Dr. Ordway gets a little too close to what's behind Walter Foster's murder when his sister Clair, Adele Roberts, and Ganss funeral assistant Connie Day, Peggy Converse, goes missing. Thats after he gets involved with them in uncovering Walters strange death. It's later that even the doctor himself becomes the victim of Ganss' and Casper's shenanigans. Thats when Casper brings in to see the doctor for help this paranoid schizophrenic, played the skeletal-looking Skelton Knaggs, claiming to be his crazed and unstable brother Louie. Casper after getting Dr. Ordway alone in his office sicks, like he was a mad and rabid dog, Louie on him who ended up shooting the doctor in the face temporally blinding him. Louie himself was soon discarded by Casper who threw him out the window of Dr. Ordways high rise building as he quickly fled the scene of his crime.
Recovering from his wound Dr. Ordway played it cool making it look like he was blinded and used that excuse to have the Walter Foster's, as well as his sister Clair and Connie Day, killers drop their guard and have them exposed, thinking that Ordway was sightless, themselves. It's then the cops, together with the crime doctor, could not only get the drop on them but get Mr.Big himself to confess. But only after Dr. Ordway risked his life in giving Mr. Big enough confidence and rope , knowing that the good doc was not long for this world, to hang himself. We and Dr. Ordway can all thank God for the invention of the good old stomach pump which without it would not have made a happy ending in the movie "Just Before Dawn" possible.