R.M. Ballantyne 
Madman and the Pirate [PDF ebook] 

Get set for high-seas adventure with The Madman and the Pirate, a gripping page-turner that will leave you wanting more. After being abandoned on a seemingly deserted island in the Pacific, the ‘Madman’ of the title happens upon a former pirate who has also been forced to make his home there. Despite mutual distaste for each other, the odd pair eventually find their way into and out of a number of scrapes and close calls.