Secrets are revealed and alliances tested as a dark power rises

All over the world vampires are falling ill. Worse, they're dying! Scientists and doctors alike are baffled. There is no cure. When both Alexey and Sam fall ill, and Cassandra learns that her own daughter has cast a curse on the vampires, she does something no one has yet to live and tell the tale: she travels to the demon world.

Along with Aitvaras and an unexpected ally, she visits her daughter on a journey that also provides new insights into her own past.

Then an ancient evil stirs again...

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Demon Queen is the final installment in the Summoner Trilogy