His name is Lavan Firestorm, a young man blessed—and cursed—with a special talent for firestarting. His legend has haunted the darkest corners of Valdemar, yet the truth has never been told. Here, at last, is his story.

Brightly Burning marks Mercedes Lackey's return to the kingdom of Valdemar, and introduces us to a portion of the otherwise unchronicled reign of King Theran. The book's principle figure is Valdemar's most powerful herald, Laven Firestorm, who comes of age during Valdemar's war with its long-time enemy, the kingdom of Karse.
Sixteen-year-old Laven Chitward's world is turned upside down when his mother is selected as a textile guild representative in the small rural community where he was raised. Moving to the capital city of Haven rips him away from his friends and boyhood pleasures, and nothing in Haven seems to fill that void. Unable to fit into the nouveau riche society, and unwilling to follow his parents into the textile guild, he finds himself adrift and depressed. His father enrolls him in a special school that will allow him to choose a trade that interests him, rather than be apprenticed against his will. There he finds himself terrorized and tortured by the boys in the sixth form until, with an awful roar, the gift of fire awakens deep within him and extracts revenge for his sadistic treatment.

With the help of a unique herald, an empathetic healer and a special companion, Laven soon learns to keep his gift under control and eventually, to direct his awful firestorm as far as he can see. When the kingdom of Karse attacks, Laven is hurried to the border to assist his king and country by repelling the invasion. During the final battle Laven earns the name Firestorm and becomes one of the most famous heralds in the history of Valdemar.