He wants to read 'a cool book about having to amputate your own leg in the jungle or something - a bit like 127 hours!' 
He doesn't like reading because 'pages are made of horrible-feeling paper' and 'books are so long and I'd rather be outside' so nothing too huge and daunting please. But he also doesn't want anything childish.
Oh, and if there could be any with female heroes as well as male, that would be extra fab.
Thanks in advance, and sorry for the many requirements!