Ghostlight

Gabe doesn't actually believe in ghosts - until he finds himself face to face with Rebecca Strand, who fell from the top of a lighthouse along with her father when she was 16.
The true story of her death is far more terrifying than any ghost tale. Rebecca’s father was a member of the Order, a secret society devoted to protecting the world from malevolent spirits like Viker, the ghost responsible for their deaths.
But the Order has disappeared, and Viker's ghost is growing ever stronger. Now Gabe and his friends must find a way to stop Viker before they too become lost souls…
“A spooktacular story that’s surprisingly insightful.” – Kirkus
“Charming, engaging and wonderfully imaginative. One that must be read.” ? Fallen Star Stories