Onyx

"Onyx" is the second book in the Lux series by Jennifer L. Armentrout. The story follows Katy Swartz, who continues trying to avoid her classmate Daemon Black despite their alien connection, while the Department of Defense arrives in town and a new student threatens to expose their secret. Katy must protect both herself and Daemon from the government forces while dealing with an enemy more dangerous than the Arum. The novel is rated for upper grade readers due to its content of profanity, sexual situations, and graphic violence.