Vanishing girls - Lauren Oliver

Dara and Nicola used to be inseparable, but that was before - before Dara kissed Parker, before Nicola lost him as her best friend, before the accident that left Dara's beautiful face scarred. Now the two sisters, who used to be so close, aren't speaking. In an instant, Nick lost everything and is determined to use the summer to get it all back.

But Dara has other plans. When she vanishes on her birthday, Nicola thinks Dara is just playing around. But another girl has vanished, too - nine-year-old Elizabeth Snow - and as Nicola pursues her sister, she becomes increasingly convinced that the two disappearances may be linked.