True it did had the same general formula on most shows and that is a good thing in most cases since the formula was so good. It was always a bad guy getting killed (which was good) and always a person with a "logical" motivation to kill the person vs. say a serial type today.

What drove me nuts on the show was about Della. She never had a life outside of work of any kind let alone any boy friends. Same with Perry, btw. In todays world Perry/Della would have been in the sack togather early on. Wow, has the world charged since Perry's days.