Here be Dragons

Jeremiah Handown and his three sons Frederik, Johann and Ludwig are shipwrecked alone on an undiscovered desert island - but surviving is only the beginning of the story. When they are captured by Arab pirates, how will they undergo being separated, sold as slaves and dragged into the depths of unexplored African deserts and jungles? But even that is only half of the story, Separately, Jeremiah and the oldest two sons, and Ludwig the youngest, make a strange discovery that leads them on the trail of the 'Mokele Mbembe' of African tales. Could this be the dragon of legend?