The Hollow Boy
The Screaming Staircase is a middle grade thriller novel by Jonathan Stroud. The story is set in an alternate modern day London which experiences an event called "the Problem", where ghosts appear throughout the city by nighttime and attack the living. Agencies have arisen to fend off the ghosts and protect the public, for a fee, but put themselves in extreme danger in the process. However, only children and teenagers have the "talent" to sense the ghosts; they gradually lose this once they reach their twenties. And so the agencies under with the leadership of people who have passed their ghost-sensitive ages and with the youth whose talents are instrumental in solving a haunting.