This feels like a book written and carelessly edited simply to capitalise on the vampire romance craze and thus is with completely unrealistic characters, unbelievable (and annoying) plot twists and in general a very amateurish read.
Plot twists are great, but the should not be something the narrator knows about and is keeping from an unsuspecting reader. As readers we want to connect with the main character and feel like we know him/her and how they relate to ourselves... this twist distances the reader from the protagonist and is the biggest failing of the whole book (which is saying something).
I won't be bothering with the others.