Dark Reunion (The Vampire Diaries #4) by L.J. Smith (1992; HarperCollins, 2010, 312pp.)
Months after Elena sacrifices herself to defeat a powerful foe in The Fury, her psychic friend, Bonnie, has disturbing dreams that foretell of another oncoming menace: a vicious, terrifying killer who seems to be unstoppable. Trying to decipher Elena’s clues from the beyond, she summons Stefan and Damon from Italy for help. Like its predecessors, the action is unflagging, and the villain is really creepy. Unfortunately, that’s the only good thing I can say about it. The events that wrap up the novel are confusing and left unexplained, leaving some confusion in their wake for the reader. And the ending? It’s more than disappointing--it’s painfully abysmal. I can’t go into too much detail without revealing the ending, but trust me - awful. However, if readers plan on tackling the second series in the Vampire Diaries universe - Vampire Diaries: The Return - then this volume is essential to understanding later sequels.