The Raventree Society Season 3 Episode 5: The End - The Raventree Society, #15

When tragedy strikes again, Kyle Hanson decides it's time to take matters into his own hands. Armed with a dangerous plan, and the help of Tyler's fast-fading ghost, Kyle returns to the place where his brother died. But Kyle cannot defeat the ghost that haunts him until he reconciles with the ghosts of his own past. And if Kyle wants to save those he loves, he has to first find the will to save himself.
In the culmination of this fifteen book series, the haunting is both within and without as we see what has been won through the sacrifices and struggles along the way. Questions find their answers, and mysteries are solved, and we approach the end.