For me, I see a „Free“ story.
Maybe there was a „New“ announcement that now (and that is news) you can play detective 4 for free. In my pop up it says free only, not new.
With a new event they state that it is brand new.
Maybe I missed it. Could you post a screenshot of the „new story“ description?
Still that would be okay for me, as it is a new story for me to play that wasn’t there yesterday.
As Happy said, don’t do it if you don’t like to. It’s free, it gives material, but you can leave it anytime.