Fading Amber (Cambion Chronicles)

Finding your soul mate is the ultimate dream come true. But for Samara Marshall, it's a matter of life and death. . . After falling for a Cambion and then turning into one herself, Samara never thought her senior year could get more complicated. The gaps in her memory, the mysterious deaths, and the constant danger that threaten her once quiet town have a common thread: Tobias, a demon with a lot of enemies. He's also Samara's other soul mate and he's suddenly disappeared. Samara knows the key to finding Tobias lies with her inner demon, who has her own agenda and threatens to take over completely. But Samara isn't the only one who wants to find Tobias. His enemies are getting closer, and their plans for retribution could mean deadly consequences for Samara and her true soul mate, Caleb. . ..