The Sixth Sense: Secrets from Beyond Series by David Benjamin, David Levithan

THERE WERE TOO MANY OF THEM. THEY WERE ALL CLOSING IN. — A passenger plane falls from the sky. Dead people are everywhere. Only Cole Sear can see them -and they all want something from him. — One little girl survived the crash. But she lies in a coma, suspended between this world and the next. — It's up to Cole to help her. Only then will he solve the mystery of Flight 333. But first, he has to listen - and do what they ghosts want. No matter what.

Five teenagers have vanished. Were they kidnapped? Murdered? Cops are on the case, but the trail has grown cold. The answer may lie with Cole Sear, the boy who can see dead people. Two of the missing teens -- one alive, and one dead -- have contacted Cole with vital information on the case. If Cole does what they want maybe they'll leave him alone -- or he may find himself among the missing.

It was long ago, but not so far away. In fact, it happened in the very building where young Cole Sear goes to school. Hundreds of years ago, it housed a courtroom, a prison, and a gallows. Occasionally, innocent victims were hanged; some haunt the school still, seeking out the person who may be able to clear their names. But unraveling history's darkest mystery may lead Cole into the kind of danger no one can protect him from.