As the Mystery of the Alien Blood continues with book four, Captured, Alexa again finds herself a prisoner of the SFVO, a U.S. government military division of the Army, dedicated to enslaving vampires. As you may recall in book three, the SFVO had discovered Alexa, Raul, Adeline, and Damien hiding on the Caribbean island, Port Bridgeford. SFVO agents kidnapped them all, then took them to their Nevada compound. When Alexa woke up inside the compound, she found a mad doctor at her bedside, who threatened to kill her, and take the baby she carries. Now as Captured begins, Alexa is locked inside a prison cell in the Nevada compound, terrified for her life. Alexa assumes Raul is also somewhere inside the compound, so she goes to hunt for him, hoping they can plan an escape. Along the way, she finds a horribly abused, teenage girl named Cassie, and decides to help her get out of the compound as well. As she's searching for Raul, Alexa runs into Damien. Together they manage to free Raul and Adeline. Their harrowing escape attempt is fraught with snags. In the end, the SFVO recaptures them. In Captured, Alexa learns the reason the SFVO has sought Raul for nearly a decade. Raul and Adeline's blood is unique, and rapidly develops the psychic and telekinetic skills of a newly turned vampire. In the SFVO's greed to create superior vampire warriors, they harvest far too much of Raul and Adeline's blood, leaving both vampires near death. Meanwhile, Damien is being repeatedly beaten and tortured for killing some SFVO guards the day they attempted to escape. Matters are tragic, and hope is waining for Alexa and the others.When Alexa is at her lowest, fearing for her loved ones' lives, the SFVO offers her a devil's deal that will free Raul, Adeline, Damien and Cassie too. But the sacrifice she'll have to make for those she loves may cost her everything.