L.J. Smith - Night World

Night World, No. 2: Dark Angel; The Chosen; Soulmate (Night World #4-6) 

by L.J. Smith

The Night World is a secret society of vampires, werewolves, witches and creatures of darkness - a place too dangerous to fall in love. In Dark Angel, Angel saves Gillian from death in the icy wilderness and then offers to make her the most popular girl at school. But what does he want in return?
In The Chosen, vampire killer Rashel is torn between her feelings for her soulmate, Quinn, and her loathing for his thirst for human blood. She loves him, but is that enough?
In Soulmate, Hannah's true love - Lord of the Night World, has come back into her life and reignited her passion. But her joy is threatened by the return of an ancient army ...