The Vanishing Stair

So I don't know how to rate this one just yet. I did enjoy parts of it, but I also felt like it had the ‘second book syndrom.'
But it was also quite exciting, if you know what I mean! It did have some amazing parts and some plottwists, which I did enjoy. But the plot in general was a bit too dramatic for me! Nevertheless I am excited to read the final installment! :D