The Yellow "M"

The Yellow "M" is set in 1953 London. We follow captain Francis Blake, a secret agent of the MI5, and Philip Mortimer, a scientist and university professor, as they find themselves embroiled in an adventure as complex as it is dangerous, in search of the mysterious M, a criminal who signs his crimes with a yellow mark and who has developed a redoutable technology that allows him to manipulate the minds of his victims.

Unfortunately the movie The Yellow "M" is not yet available on HBO Max.