Oculta
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Oculta is the second book in the Forgery of Magic series.
Nocturna (book #1) can be found on any Cowboys Read! cart.
Oculta by Maya Motayne
Text from the back cover:
Alfie and Finn haven't seen each other in months after joining forces to save Castallan from an ancient magical evil. Alfie is finally stepping up to his role as heir and preparing for an international peace summit, while Finn is reveling in her freedom from Ignacio. That is, until she unexpectedly installed as the new leader of one of Castallan's powerful crime syndicates.
And in San Cristobal, the mysterious organization responsible for Alfie's brother's murder resurfaces -- and their newest target is the summit. Finn and Alfie are forced to work together to follow the assassins' trail and preserve Castallan's hope for peace. But will they be able to stop these sinister foes before a new war threatens their kingdom?