Rose, Kathryn

In the aftermath of Morgan le Fay's war on Camelot, Vivienne, Merlin's former apprentice, secretly builds an aeroship which the Lady of the Lake believes will ensure success in the quest for Avalon and the Holy Grail, but when things go wrong, Vivienne comandeers the aeroship for a rescue mission.

Eighteen-year-old Vivienne, lady-in-waiting to the future queen Guinevere, is secretly apprenticed to Merlin the magician and helps him try to create a steam-powered metal beast to defeat Morgan La Fey, King Arthur's sorceress sister, when she declares war on Camelot.