The Sixth Crusade — Mark Butler

Europe - The Dark Ages. The church is bankrupt, the Fifth Crusade a colossal failure. When King Frederick, the Holy Roman Emperor, embarks on the Sixth Crusade, Leonardo di Spie, a spy, thief and killer, is entrusted with keeping him alive against insurmountable odds.

In a sweeping historical saga that races from war-torn Europe to Egypt, Leonardo quickly discovers that the line between honor and treachery shifts like the desert sands, and the road to Jerusalem is steeped in danger, betrayal and blood.