Damn, you reminded me that I have to plan one as well. Any cool ideas for a one-off that anyone wants to share? We got a total beginner who wants to dip his toes in.
In my case, not just the next session, he would find out what the big mystery is and also all the secrets of the other characters.
But I don't think he would read any of it, he loves D&D too much to spoil himself :)