What the movie "Hostile Witness" is is basically an episode of the television show "Perry Mason", though filmed in color and having a feature length running time. Actually, it's based on a stage play by Jack Roffey, who also wrote this movie's screenplay. The stage origins of this movie are pretty clear; most of the movie takes place in a courtroom. But that wasn't a real concern to me, since I enjoy plays as well as movies. Though while this play turned movie can't be considered awful or bad, it all the same feels like familiar stuff. While there is the novelty of it taking place in England, otherwise you will have seen this kind of story done many times before. If you can't get enough of "Perry Mason" or similar courthouse movies and TV shows, you will probably enjoy this. Otherwise, most likely you'll find this particular telling unexceptional.