“Well, what’s the plan?” asked Biggles the following morning as he ripped open the top of a tin of bully beef for breakfast. “I think we’ll push straight along on foot for the cave; we are on the right side of the river for it,” replied Dickpa. “We’ve only about a quarter of a mile of forest to get through and then we come out on to the matto. I don’t think we can be more than seven or eight miles from the cave at most, and we could do that in three or four hours. That should give us time to break down the wall and get back again before nightfall. The first thing we’ve got to do is to find out what is behind the wall. If there’s nothing, well, we just go home again, that’s all. If we strike lucky, we shall have to make our plans according to what we find to bring away. I think the machine

