Merlin : Sword and Sorcery
Jacqueline Rayner

When Merlin and Morgana join forces to save a child the king has commanded be put to death, they soon discover that going against King Uther could prove fatal.

Meanwhile, a mysterious Black Knight arrives to challenge the Knights of Camelot to mortal combat. Old secrets, long hidden, are stirring and the king is afraid for his only son. The Black Knight seems invincible and Merlin senses that only magic can stop him...