They should have made the title:
Lemony Snicket's Series of Unfortunate Events
Because the "A" in there makes it sound stupid. I know what they mean, which is the common phrase of "a series of unfortunate events," (for example, A series of unfortunate events took place during my stay at the hotel), but it reads awkwardly with the "A" in there. Just get rid of it.
Wait, is that the author's name? Why not just take his name out all together making it it just:
A Series of Unfortunate Events?