Biggles and the Missing Millionaire

Yes, another Biggles book. About what happens when a supposed millionaire disappears. The plot/reason for the millionaire's disappearance, is rather far-fetched I have to admit. Leaving with the intent of forming a revolutionary army? However, the action itself was well written, and I enjoyed the story as a whole. After all, something doesn't have to be particularly believable to be interesting, does it?