You never know what you're going to end up with when you pick up a free book, and there are a lot of stinkers out there, but this is definitely well worth reading. It's an adventure story about two young men, one in his early twenties, the other about sixteen, who embark on an adventure to Peru in search of ancient treasure so the elder brother can marry. Harry and his younger brother Bertie join up with a local guide, Dias, his wife, and their nephew. Managing to escape political upheavals, they are attacked by robbers, struggle through the back country of Peru in search of lost Incan gold.
I suspect you could probably classify this as a 'young adult" novel because the plot is uncomplicated, but it is still a fun book to read and I highly recommend it.