It is very difficult to maintain the same quality throughout a longstanding series as this one(this is number 27...). And although that the storyline is still very good,the development of the characters is too detailed(looks,hand movement, breath taking,frowned eyebrows...).But this is unfortunately not exactly an added bonus. It does not lead to more understanding, more depth...
That said,one of the main characters is the city of Venice and Venice fulfils its role to perfection!