The good Danes have got an excellent podcast called Det Hemmligste af det Hemmelige, which goes into depth about the secrets of the cold war era, intelligence, stay behind etc. In particular they’ve delved deep into the murder of Swedish PM Olof Palme, in numerous episodes. This they’ve done in a remarkably dedicated fashion, having managed to curate and structure the available material in a coherent fashion, as well as managing to unearth new information, including interviewing certain people of relevance, collaborating with an experienced Danish police detective to get takes on some stuff, and more. Plus they’re essentially trying to build up a complete solution along the lines they find most probable. As a Swede I find it extremely helpful to get an ”outside take” on certain things, helps in the evaluation of them.
The podcast is in the Danish language which unfortunately restrict the number of potential listeners on the board quite a bit. It is also subscription based and cost DKK 239 per three months, but I would recommend it if you have any interest at all and can understand Danish. Some of the episodes are also available for free at the start page of their website, if you want to try it out first: https://dethemmeligste.dk/