The Power of the Scabbard

The Scabbard of Invincibility finally has its four black diamonds in place and this means its powers are back in action: when Al wears it, he is invincible. When he, Owen and Snakeboot the cat return to the Dragon Blood Islands, Gunner is delighted. But can Gunner be trusted? After docking in town, Gunner sends the two boys, along with Mahoot, to buy a compass. While the trio is away, Gunner sails off with the sabre and scabbard, leaving the boys behind.