It is a stand-alone novel, has an oblique reference to King Arthur, and is not a part of Stewart's Merlin Trilogy.

When Alexander comes of age, he sets out to Camelot to seek justice from King Arthur and to avenge his father's death.

[2] Prince Alexander is diverted in his quest by the enchantments of Morgan le Fay, the seductive but evil sorceress.

She persuades him to attempt a theft of the cup so that she can gain power over King Arthur and his court.

The tale is a self-contained novel taking place during Arthur's reign (possibly during the events in The Last Enchantment), and does not continue the story of The Wicked Day.