Carter Blood follows the tale of Galdorwide where the ghost of the vengeful king is still terrorising the kingdom. Bella the Queen is doing everything in her power to prevent the attacks, but when she is made to step down from the throne, the children and the ministry know things have taken a turn for the worse. Aisley has returned from the dead, Ace has his own notorious plans to overcome his Nullumness, and the children are left to fight their own battles.

The attacks begin taking the lives of the students of Galdorwide High and it is revealed that the king plans to unleash a monster that can only be defeated by a male Carter. But there being no male Carter left, how will the kingdom defend itself against the unconquerable monster?