The third episode finds Margot firmly entrenched within the police department, although her participation is one of those "suspend disbelief" things -- sort of like believing the vicar in Grantchester solves all those murders. This plot is as convoluted as the first two, with some whopping coincidences. One of my problems (and admittedly, not the show's fault) is trying to keep up with the dialogue as I read the sub-titles, and try to keep track of the various characters. Margot seems to be having a wonderful time solving these crimes, at least, which helps viewers do the same.