Longsword (III) Holy Warrior is the third of the adventures of Hugh Longsword, swordsman, spy and assassin in the turbulent, war-torn 13th century.

1271 AD. The civil wars in England are over and the Lord Edward has sailed to the Holy Land to save what remains of the crusader states. Abandoned by his allies, Edward insists on pushing on to Acre, one of the few cities still in Christian hands. On the way his fleet is almost destroyed by a storm, and he arrives to find Acre threatened by the host of Baibars, the all-conquering Mamluk sultan of Egypt. Among Edward’s followers is Hugh Longsword. With Acre surrounded, Hugh is sent on a vital mission across hundreds of miles of enemy territory. His task is to deliver a message to the Tartars, the only power on earth that can defeat Baibars.