Heir of Sea and Fire is a 1977 fantasy novel by American writer Patricia A. McKillip,[1] the second book of the Riddle Master trilogy.

Raederle, the titular heir of sea and fire, was promised by her father to the man who won a riddle game with a ghost.

As the book opens, Morgon has been missing for a year; he is presumed dead, as the land-rule he possessed over the land of Hed has passed on to his heir.

Midway through the story, Reaerle discovers that Morgon is alive, with both shapechangers and Ghisteslwchlohm, an ancient, traitorous and extremely powerful wizard, pursuing him.

Sensing a powerful force pursuing her, Raederle uses her abilities to confound it, thinking she is protecting Morgon; but discovers that the force she thought was Ghisteslwchlohm is Morgon himself, who had stolen much of Ghisteslwchlohm's power during his long captivity, while the helpless man he pursued was Deth, who had betrayed him.