Evermore by Alyson Noel

This is an excellent YA book.  There is plenty to keep the reader constantly interested.  This is the first in a series so I will definitely be reading the rest of the series.

 Seventeen-year-old Ever survived the car crash that killed her parents, younger sister, and their dog. Now she lives with an aunt in Southern California, plagued not only by survivor guilt but also by a new ability to hear the thoughts of all around her and to see and talk to her sister Riley, who did not survive the accident.

She tries to tune out all these distractions by keeping her hoodie up and her iPod cranked loud, until Damen, the cute new boy at school, convinces her to come out of her shell. Damen, however, is frighteningly clever—and has the strange ability to produce tulips from nowhere and disappear himself at critical moments.