Silence (#2) by Becca Fitzpatrick

SOMETIMES SILENCE CAN SPEAK VOLUMES... 
After waking up in a cemetary with no memory of the last few months, let alone the last five minutes, Nora Grey discovers that she has been missing for weeks. As she struggles to put the pieces together and resume her daily life-- hanging with her best friend, Vee; going to school; and avoiding her mothers creepy new boyfriend-- she gets the feeling that everyone knows more about her disappearance than she does. 
When she meets a mysterious stranger whom she is simultaniously drawn to and afraid of, the pieces of the puzzle start to come together. As he begins to shed light on the events that led to her memory loss, Nora discovers that not only is she about to embark on the fight of her life, wedged between ancient enemies she can barely comprehend, she's also falling in love. But even with all these strange new occurrences happening around her, she can't help feeling she has done this all before.