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Katana Nidan: The Unwritten Koan

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When the secret to immortality is stolen, the war for its knowledge begins… At the Hall of the Dragon, teenager Katana trains in magical martial arts. But a centuries-old samurai has stolen a scroll from...
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  • 11 August 2026
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A young adult urban fantasy of magical martial arts, secret scrolls and a teenage student racing to master new skills before her school comes under attack. Book two in a coming-of-age series of chi magic, mentors and ancient rivalries.

A Stolen Scroll. A Secret Worth Killing For. One Student Standing In The Way.

The Arashi have stolen the Scroll of the Five Masters from the Hall of the Dragon, but their master can't unlock its secret: the key to immortality. Convinced the answer lies in the temples' secret archives, he prepares to strike at the Hall itself.

The masters launch a covert mission to stop him, yet every day of silence brings the attack closer. Katana has already mastered two of the mysterious Chen Do skills and is close to a third. When the enemy finally infiltrates the Hall, her mentor's fate will rest in her hands.

Perfect for fans of Patricia Briggs, Ilona Andrews and Kelley Armstrong.

Praise for the Katana series:

★★★★★ “Very satisfying... can't wait to find out what happens next!”

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Price: $19.99
Pages: 336
Publisher: Vinci Books Ltd
Imprint: Vinci Books Ltd
Publication Date: 11 August 2026
Trim Size: 7.80 X 5.08 in
ISBN: 9781036708917
Format: Paperback
BISACs: YOUNG ADULT FICTION / Action & Adventure / General, Urban fantasy, FICTION / Fantasy / Urban, FICTION / Fantasy / Contemporary, FICTION / Occult & Supernatural, FICTION / Fantasy / General, Contemporary fantasy / Low fantasy, Occult fiction / Paranormal Horror, Children’s / Teenage fiction: Contemporary and urban fantasy, Children’s / Teenage fiction: Mythic fantasy / Myths and Legends fiction
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Ken Warner grew up reading science fiction and fantasy; his early favorites were The Chronicles of Narnia, Dune, and of course, Lord of the Rings. When he began his martial arts training in high school, he heard many myths and legends about masters who possessed mysterious powers, typically attributed to their internal chi energy. He often thought these legends would make a great story. This ultimately led to his first books, The Katana Series. Ken continues to focus on science fiction and fantasy in his writing. He went full time with his author career late in 2020. Ken lives in Connecticut with his wife, Parveen, and their many dogs and cats.