Eric Pohlmann is "Sapolio", quite a large fellow who declares that he is going to have himself locked in a glass room for 70 days without food. Can he survive? Well it turns out, in this short thriller, that he might be a damn sight safer than some of those outside - as murder is afoot. "Pel" (John Ireland) who has promoted this affair - and who hasn't two pennies to rub together - is initially a police suspect but as the investigation narrows, it looks like only the man in the glass box might really know what happened! John Ireland is adequate in this hour-long film as is his on-screen wife Honor Blackman ("Jenny"); Geoffrey Keen ("Stanton") has a bit more than usual for him to get his teeth into and a stalwart cast of British reliables all help keep it rumbling along well enough. I found the ending a bit daft, but I suspect most of whatever budget it had went on Ireland, so that's maybe to be expected. Basic, wordy but still watchable.