The Horned King is released from the Cauldron & mysteriously brought back to Prydain. Not even he knows why, except that the Fates have given him an impossible task he must complete before his time is up, or his soul will be sent back to the Cauldron. For all Eternity. For a short time, he controls his own Fate. Will he spend it wisely, or give in & revert back to his old ways?

When the Pigmask army invades the world of Prydain, Taran must form a "Pact" with the Horned King to rid the land of the invading army. But can two enemies truly stand together, long enough to save Prydain? Can Taran adjust to the pact-price he had to pay?