Secret Venture is a 1955 British B-movie thriller film directed by R. G. Springsteen and starring Kent Taylor, Jane Hylton and Kathleen Byron.

Renowned scientist Professor Henrik (Hugo Schuster) returns to England from a working trip overseas and is met by his glamorous secretary Joan (Hylton).

Later, Henrik is abducted by a group headed by a sinister man named Zelinsky (Karel Štěpánek), who are eager to lay their hands on the formula.

O'Hara finds Weber (Frederick Valk) in Paris, and learns that he now has the briefcase in his possession but is unable to decipher the contents which appear to be written in a complex code.

The scene is set, as O'Hara and the police try to establish whether the apparently innocent Joan has in fact betrayed Henrik and been a prime mover in the plot all along.