Leaden dialogue. Anyone who knows the structure will know just about everything that is going to happen before it does. Given that its sort of like rowing a boat on a pond to let it just flow along till you come to the end. I knew the killer the moment I saw him, but that was because in this type of mystery the killer must always appear very early and look completely irrelevant. The character fit the bill just about perfectly . Cardboard characters, but hey it's a TV series. All in all about par for the course for American art these days. Makes you realize just how much the world has changed since this came out. Don't think the complacency of this show is possible today.
Review of Mystery 101
