Felipe Corvo 
Mystery at the Farm #23 [EPUB ebook] 

School holidays: what’s better than enjoying these days in the middle of the woods, bathing in rivers and waterfalls, breathing "pure air", so nonexistent in urban centers. Well, Mauricio, a typical city boy, overloaded with school tasks and technological things, can’t wait to pack his backpack and leave for Santa Helena de Goias, the address of Uncle Bebeto’s farm. There, like so many other times he visited his cousin, he will experience new adventures, discoveries of puberty, only this time something unusual will change their lives forever.