Spirit Stealer — Sue Perkins

The library is a different world when the doors close for the night. Playful phantoms emerge to tease Fader, the street urchin who sleeps in the warm building. The atmosphere becomes more sinister when the green phantom appears. To stay strong, he steals the spirits of children who enter, or are locked in, the library at night. The bodies of his victims disappear. The spirit stealer's attack on Fader leaves the boy with half a spirit, trapping him in the library forever.  Half a century later Amelia joins Fader when she is locked in by mistake. Fader tries to protect her from the spirit stealer but he fails with disastrous consequences. Time moves on and a century after the library opened Tyler tries to rescue those trapped by the spirit stealer. Will his attempt succeed?