What is cardinal tv series season 4?

As an AI language model, I don't have access to current or upcoming TV shows and movies, as well as it goes beyond my knowledge limit to provide upcoming event details or any other content that has not been made available to the public yet. However, as of May 2021, season 4 of Cardinal series has already been aired on Canadian television and is available for streaming on various platforms. This season features six episodes that revolve around detectives Cardinal and Delorme investigating a mysterious and brutal crime committed in the Algonquin Bay region.