- André Morell, Barry Jones, Eric Pohlmann, Geoffrey Keen, Gerard Heinz, Jean Simmons, Kenneth More, Lily Kann, Maire O'Neill, Maxwell Reed, Michael Brennan, Richard Wattis, Sandra Dorne, Sonia Dresdel, Trevor Howard
- Ralph Thomas
- Crime, Drama, Film-Noir, Mystery, Thriller
- December 25, 1950
When Secret Service agent David Somers is fired, he takes a quiet job with the Fentons at their nation property – cataloging butterflies, therefore the title insect. David grows keen on Jess Fenton’s niece, a fragile, fey younger lady named Sophie. As a result of he hates traps of any sort, he reacts rapidly when Sophie is framed for the homicide of Hick, the nasty handyman. He helps her escape London by utilizing his agent’s expertise and a community of outdated pals. The pair lead the police and David’s ex-employers an thrilling chase, from Newcastle to the Lake District to Liverpool. Because the fugitives attempt to catch a ship for France, everybody, together with the assassin, be part of within the finale.