Vampire Diaries: The Return: Shadow Souls (Book 6) - L.J. Smith

Elena Gilbert finds herself at the center of magic and danger once again, but Stefan is nowhere to help her. She must rely on Damon, the dangerous and irresistible vampire who desires her completely.

Their journey takes them to the Dark Dimension, a realm where vampires and demons rule and humans live as slaves. Stefan is imprisoned there, and Elena must locate two hidden key halves to free him.

As the stakes rise, the tension between Elena and Damon grows, forcing her to confront a heartbreaking choice: which brother truly holds her heart? Drama, danger, and star-crossed love dominate this thrilling installment of The Vampire Diaries.