On the Menod isle of Tenkor, Tor seeks the help of a young tiderider who rides the bore tides to The Hub for the Tideriders' Guild. But Elarn has his own problems: his father despises him as tainted, and he is in love with Jesenda, the daughter of Duthrick, Keeper Councillor.
As the story builds to a climax, Flame chooses to marry the Islandlord she once fled from on horror, while Elarn has to choose between his love for Jesenda and his patriotism on one hand, and his loyalty to his faith and Menod morality on the other. In the meantime, Tor has to choose his path to the future, knowing his judgement is affected by his contamination with dunmagic.
And, in the future, Anyara isi Teron has set sail for the Isles of Glory - to find out what really happened.