Canary
Correct, I fixed my original post (I know what The Yellow Butterfly is, maybe I had a senior moment !).
Anyway, I should add that Pat Boone put up his own money to finish the picture, which had a super-quick shooting schedule anyway. And the film was restored, and in Cinemascope but filmed in B&W. I'm not sure I've seen many Cinemascope in B&W, but there are some.