Anyone nice enough to summarise all the cases?

So I really did enjoy the series, but i have no idea if i'm just dumb or sth but I found it a bit hard to follow the cases? I feel like I kinda grasped what was happening overall, but if anyone has some spare time on their hands and has nothing else better to do, would they so kindly be able to summarise what happened in each case and how they progressed the plot?