Augusta Stack was almost killed in a deliberate traffic accident. As a result, she's in the hospital...where Ellery Queen (Ralph Bellamy) is working undercover. She was shaken up and her leg broken...but oddly she died in surgery! Soon, other bodies start piling up and when the cops and Queen investigate, they find lots of people who had reason to kill the old woman...and perhaps the rest. Can Ellery solve the crimes before his lady friend, Nikki (Margaret Lindsay) gets herself killed while snooping into the case as well?
During the 1930s and 40s, a zillion B-murder mysteries were made in Hollywood. They all had a lot of similarities and cliches (such as in this one where Nikki essentially confronts the murderer while having no backup nor a weapon with which to defend herself!). But it is an enjoyable film...worth seeing if you like the genre and a bit better made than usual.
By the way, unlike many sleuths (such as Charlie Chan), tons of different actors played Ellery Queen and none came to own the role or appear in more than a few films. It's a shame Bellamy didn't do more of these films...he was pretty good here.