The Replacement: Book 1 of The Replacement Series

Angelica would have done anything for Merrick—even die for him, but when they are caught running away together, she faces a fate much worse than death.The Lymerians have lived in secret on Earth for centuries by following strict rules and obeying the assignments given to them by their council leaders. When one of their own falls in love with a human girl, they decide to transition her human form to Lymerian, stealing her mortal life. Until the reformation is complete, Angelica will be imprisoned