Dick Maitland is working as a doctors apprentice in the East End of London, at that time a place of great poverty. The doctor with whom he is studying is rather a philanthropist for, instead of setting up trade for the wealthy, in Harley Street, he is curing the poor for practically nothing.
Dicks family circumstances take a turn for the worse, and he goes down to the docks to work his passage to South Africa. He has no idea how he will proceed when he gets there, having no money, but he meets a rich young man called Grosvenor on the ship, and, striking up a friendship, they decide upon going together on a voyage of exploration.
After meeting a tribe whom this author, Collingwood, had written about in a previous book, and sorting out various problems there, they proceed on their way. They had heard rumours of a mysterious white race living not too far away, and they decide to investigate. These turn out to be one of the lost tribes of Israel. They are eventually accepted there as friends, after initially being taken prisoners. Here again they are able to sort out various problems. Grosvenor marries the Queen, and Dick, who in the course of these travels has managed to find some very valuable jewels, eventually returns home with them. He converts them to cash, and is able to provide his poor old mother, whom he had left in abject poverty, with a luxurious style of life. He also puts lots of money in the account of the doctor with whom he had been working before these adventures began.