Hal Ashby (Bruce Cabot) is a newspaper reporter determined to find out who is behind a spate of arson attacks in the city. The mayor is feeling the pressure to stop the attacks, but he is also under pressure from an industrialist bankrolling him.
He thus tries to pressurise the newspaper led by Sam Hardy. A complication is that the industrialist (H.B. Warner)'s daughter Helen (Judith Allen) is working for the paper too and gets involved with Hal...
Although pretty predictable Night Alarm is a decent watch with good performances by the leads Cabot and Allen with an exciting conclusion... though no surprises that it involves a fire! Actual fire footage is well woven into the film to elevate it above it's slim B-movie budget.