The whodunit part is fairly complicated involving a newspaper rivalry, a faked murder that turns real, along with Torchy and her cop buddy trying to stay out of trouble. Logic-wise, the plot's more than the usual stretch.
I haven't seen other entries in the Blaine series so I can't compare. This programmer, however, carries the earmarks of 30's style WB—fast paced, lots of street-wise mugs, few lengthy talk scenes, and a sassy blonde. Torchy (Farrell) is a cannily aggressive reporter who pairs up with cop Steve (Mac Lane) to scoop rival reporters. Note how, in one scene, she even takes over Steve's seat at the station house. There's some typical lowbrow humor from the likes of Tom Kennedy who specialized in such roles. And catch tough guy Mac Lane in what's almost a leading man role, certainly a departure for him. Likely a handsomer Lawler (Hugo) was added to compensate in the looks department. I guess I missed Perry Mason's William Hopper who's in the credits, but short on screen time.
Anyway, the programmer's okay as a time passer, especially if you keep a note pad to keep up with the plot, but otherwise it's nothing special.
(In passing—Over the years, I've surmised that whenever viewers see a city street closed off at one end by a cross street, that means it's a back lot set, as is the case here.)