If You liked the book Twilight. . . .

Blood and Chocolate by Annette Curtis Klause
Vivian isn't the ordinary teenager she appears to be. She is actually a werewolf that can go back and forth between her human form and her wolf form except during the full moon when she cannot control her change. After her father's death, Vivian and her pack move to a new town. At school she feels bored and lonely until she meets Aidan, a human boy with a fascination for all things dark and magical. Can Vivian love a human boy and remain loyal to her pack or will her love for Aidan prove disastrous for them all?

Bloodline by Kate Cary
Lieutenant John Shaw is a World War I officer sent to the front lines. His commanding officer is Captain Harker, a man renowned for his bravery in battle. However, Shaw observes in Harker not just bravery, but a disturbing lust for battle. After Shaw is wounded and is sent back to England to recover he meets Mary Seward, a young nurse. However, Shaw's recovery is interrupted when Captain Harker comes to England to check up on Shaw. Instead, Harker meets Shaw's younger sister, Lily. He quickly seduces her and convinces her to return with him to his home in Transylvania. John and Mary must chase after them to try to save Lily before she falls under the same curse from which the rest of Harker's family suffers.

Blue Bloods by Melissa de la Cruz
Fifteen-year-old Schuyler Van Alen thought she would never have anything in common with Mimi Force and the other snobby rich kids at her prestigious private school. But when she is invited into an exclusive charity committee with Mimi and her rich friends, she learns they have a lot more in common than she thought, including a dangerous enemy.

Companions of the Night by Vivian Vande Velde
Kerry Nowicki never thought vampires existed until she saved one's life. However, Kerry's good deed put her whole family in danger and her brother and father are kidnapped. She doesn't know who she should trust, the vampire whose life she saved or the people trying to kill him.

Devilish by Maureen Johnson
Jane is worried about her friend Ally. Ally who is not very popular has just been humiliated at school. Ally vows to become popular and the next day comes to school with new clothes and a new haircut. Over the next few weeks Ally's wardrobe becomes more and more fabulous while she acts more and more mysterious. Ally finally confesses that she has sold her soul in exchange for popularity. Jane doesn't believe her and brashly offers to swap places with Ally. However, Jane soon learns that the deal is no joke. Can she save her soul?

Hawkes Harbor by S. E. Hinton
After a deal gone wrong, Jamie Sommers, a professional jewel thief, needs a place to lie low for a while. He decides to hide in the small town of Hawkes Harbor. However, it is in Hawkes Harbor that he comes face to face with a danger greater than anything he could ever have imagined.

Midnight's Choice by Kate Thompson
Tess is a switcher which means that she has the ability to change into an animal form. Now Tess faces an incredibly important choice, literally a chose between good and evil. She must decide whether to permanently switch into a phoenix or a vampire for the rest of time.

Peeps by Scott Westerfeld
When he goes to New York City to attend college, Cal picks up an unusual parasite. Left untreated it causes an aversion to sunlight and familiar objects, and an uncontrollable desire to bite people. Fortunately for Cal, he is naturally resistant to the parasite. He now works for a secret agency that tracks down others who have been infected by the parasite and helps them including all his old girlfriends.

Shattered Mirror by Amelia Atwater-Rhodes
On her first day at a new high school, Sarah Vida, a witch who comes from a family of vampire hunters, meets two vampires, Christopher and his sister Nissa. They claim they have sworn off killing humans. Though Sarah knows it is forbidden to befriend a vampire, she finds herself attracted to Christopher since he is not like most vampires. Things get complicated when Sarah finds out that an evil vampire named Nikolas who her family has been hunting for over a hundred years is actually the twin brother of Christopher.

Tithe: A Modern Fairy Tale by Holly Black
Kaye discovers she is a changeling. She is actually a faerie who was switched at birth with a human child and raised in the human world. After she finds out she travels to the faerie world, but once there she realizes her new world is full of dangers and the only person she can trust is a dark faerie prince.