That’s pretty much the story what happened to Kristen and what’s happening between the two of them? Things start picking up around the last 40 – 30 pages. The only problem is, he’s hot, then he’s cold, and Abbey never really knows what’s going on with them. Then Caspian enters, and Abbey falls for him. Questions spring to mind automatically for the reader, but you’ll have to wait a while for even a smidgen of an answer. Abbey doesn’t believe she’s dead, but she has no clue what happened. It starts off with Abbey at the memorial service of her best friend, Kristen, and it’s quite intriguing. How could Kristen have kept silent about so much? And could this secret have led to her disappearance or even her death? Hurt and angry at Kristen's betrayal, Abbey turns to Caspian for support.and uncovers a frightening truth about him that threatens both their emerging love and her sanity. But when Abbey finds a diary hidden in Kristen's bedroom, she begins to question everything she thought she knew about her best friend. And when Abbey meets the gorgeous, but mysterious, Caspian at Kristen's memorial she starts to feel like she has something to hold on to for the first time since Kristen's disappearance. While everyone is all too quick to accept that Kristen is dead, Abbey refuses to believe that she is really gone.

But when her best friend, Kristen, vanishes at the bridge near Sleepy Hollow Cemetery, Abbey's world is suddenly turned upside down. Growing up in the town of Sleepy Hollow, the mystery and intrigue over Washington Irving's classic legend are all part of daily life for sixteen-year-old Abbey. The Hollow by Jessica Verday (review copy) - I would have a hard time summarising this book myself for several reasons, so the following is from Amazon UK:

The hollow series jessica verday