What do you think is the fastest way to do that type of "mystery puzzle" in real life? Or if you were playing detective. Practice and think in formal logic? Practice deductive reasoning and use common sense? Something else?
As long as you can analyse it to prove your argument and is related to the module, it'll be fine.
Aside that, does anyone have any general advice on mastering permutations and combinations?
Mrs Smith is lying, so Moriarty has not escaped which means Moriarty is not Jones. Lastly, Moriarty is either dead or is Jones and we know that Moriarty is not Jones which allows us to conclude that Moriarty is dead!
Hard part was concluding Moriarty is not Jones given that Moriarty has not...