Twin Secrets by Lisa Doster

Alisa has the rare ability to see people’s feelings. But her gift has not always been a blessing. Growing up she is constantly teased, finding it very difficult to make friends. After struggling to finish college, Alisa decides to move to Key West to begin a new life. She lives with her brother and owns a gym. Her life is simple and tranquil until a surprise visitor arrives: an unknown twin sister. Alisa learns from her twin sister that her gift of seeing feelings is a result of being a Patronus, a noble race that protects humans from vampires and werewolves. Her twin sister instructs her in the arts of the Patronus and she learns to focus her powers. Yet all is not well in the Patronus world. A new King has usurped the throne and seeks to capture Alisa and her twin sister. Together, along with a dedicated group of friends, the twins must escape the clutches of the false King.