This story is about two boys, two faiths, and one unholy war.

When Adam's mother dies unconfessed, he pledges to save her soul with dust from the Holy Land.

Employed as a dog-boy for the local knight, Adam grabs the chance to join the Crusade to reclaim Jerusalem.

He burns with determination to strike down the infidel enemy ...Salim, a merchant's son, is leading an uneventful life in the port of Acre - until news arrives that a Crusader attack is imminent.

To keep Salim safe, his father buys him an apprenticeship with an esteemed, travelling doctor.

But Salim's employment leads him to the heart of Sultan Saladin's camp - and into battle against the barbaric and unholy invaders ...