Counterblast (also known as Devil's Plot) is a 1948 British thriller film directed by Paul L. Stein and starring Robert Beatty, Mervyn Johns and Nova Pilbeam.

A Nazi scientist escapes from prison, murders a leading professor and takes his place at a research laboratory, where he experiments with biological warfare with which he intends to wage the next war against Britain.

The Monthly Film Bulletin wrote: "The story, which is not only topical but which also seems rather disturbingly plausible, offers plenty of scope to Mervyn Johns to display to the full his dramatic ability, and as Bruckner he makes the most of his opportunities. ...

A trifle far-fetched and over-long, it nevertheless holds the interest and sees that poetic justice spectacularly overtakes the villain in the end.

camp in England, murdering an English scientist, just arrived, from a ten-year stay in Australla, and taking his identity, to hold a responsible job at a scientific research station while he secretly continues his studies in bacterial warfare in preparation for the next Nazi war?