Synopsis of the novel Vampire Diaries – Dark Reunion
As a psychic, Bonnie has dreams of Elena in the Other world. But the dreams quickly turn frightening, which then causes the death of one of their friends. A source of power has infiltrated Fells Church, putting its inhabitants in danger. Not knowing what to do, Meredith, Matt, and Bonnie use a summoning spell to call for Stefan and Damon. Bonnie takes the leading role as she writes in the diary. She also finds a possible romance with Matt Honeycutt.
After some research in the library Stefan realizes Tyler Smallwood is a werewolf. They concoct a plan and lure Tyler into the graveyard. After threatening him, Tyler reveals startling information about the killer. They find out Klaus, the vampire who made Katherine a vampire is the killer. The four find out from Meredith's mad grandfather that the only thing that can weaken Klaus is White Ash wood. Klaus makes a deal with Stefan, "Come alone or the girl dies." and a scarf that the girls remember Caroline wearing to Meredith's birthday party.
Bonnie, Meredith and Matt try to persuade Stefan to take some of their blood to make him stronger but he refuses and warns them not to follow. They ignore his threat and follow. They see Stefan with a branch of White Ash wood and Bonnie realizes it's a trap and cries out to Stefan before he gets hurt. There is a fight at the old Francher place deep in the Old Wood. They are losing the fight and Stefan is on the brink of death.
Damon appears out of nowhere and proves his loyalty as he stakes Klaus. However, Klaus isn't hurt badly, and he attacks Damon. Bonnie screams for Elena. She appears as a glowing mist along with the spirits of Civil War soldiers that had fought and died in Fell's Church. They charge Klaus and carry him away. The ending is the most surprising yet for Elena's friends as she almost leaves forever and then is granted another chance to come back to life so she takes it.