Description: Following the Prime Minister's men, Tony and David discover a hidden storage cave containing their ship's sails... and gunpowder, perfect for blasting a gap in the reef that is keeping them from sailing out of the lagoon. Mark and Tony return to the cave for some gunpowder but are trapped inside when Quig and Quell return with their men. The boys escape detection but Tony's map is found, revealing the location of their camp. While Mark returns to warn the others, Tony goes to the Q village to enlist the help of the Quinns. Having amazed the Quinns with his walkie-talkie, and creating a suitable diversion, Jeremiah sneaks into the jail to reclaim the map only to be stopped by the Prime Minister's arrival. Perplexed by the map, the Prime Minister decides they'll find the children by searching the swamp, a region that has always been taboo for the villagers. Knowing Quig and Quell will be coming, Tony and Mark devise a plan... Using the walkie-talkies, they are able to scare the guards off keeping the tree house and ship safe.