In
Mistress of the Rose Moon
, the final installment of the Heirs to Camelot series, Britain has sustained 27 years of a glorious renaissance: New London is beautiful, the economy is dynamic and fair, a strong King Arthur II and Queen Ava rule and are world leaders. But then the Holy Grail appears, challenging the heirs for the final time. Initially, all the Heirs - Sibbie, Falke, and Arawn for the Goddess, and William Kasdeya for Adramelech - seem to get along. But as Kasdeya falls further under the Dark Lord's sway, the trials become more dangerous, and death is a breath away. Can they get all the keys to the Grail before Midsummer night, or will Kasdeya kill them all and Adramelech will rule the world?